Depression and Suicide



Depression is a potentially life-threatening mood disorder that affects 1 in 6 persons in the United States, or approximately 17.6 million Americans each year. Depressed patients are more likely to develop type 2 diabetes and cardiovascular disease.[1] Not counting the effect of secondary disease states, over the next 20 years, unipolar depression is projected to be the second leading cause of disability worldwide and the leading cause of disability in high-income nations, including the United States.[2]

Morbidity associated with depression is difficult to quantify, but the lethality of depression takes the measurable form of completed suicide, the tenth leading reported cause of death in the United States.[3]

The current economic cost of depressive illness is estimated to be $30-44 billion annually in the United States alone. In addition to considerable pain and suffering that interfere with individual functioning, depression affects those who care about the ill person, sometimes destroying family relationships or work dynamics between the patient and others. Therefore, the human cost in suffering cannot be overestimated.

As many as two thirds of people with depression do not realize that they have a treatable illness and do not seek treatment. Only 50% of persons diagnosed with major depression receive any kind of treatment, and only 20% of those individuals receive treatment consistent with current practice guidelines of the American Psychiatric Association (APA).[2, 4] More alarming, in a large Canadian study, 48% of patients who had suicidal ideation and 24% of those who had made a suicide attempt reported not receiving care or even perceiving the need for care.[5]

Persistent ignorance about depression and blatant misperceptions of the disease by the public, and even some health providers, as a personal weakness or failing that can be "willed" or "wished away",  lead to painful stigmatization of sufferers, and avoidance of the diagnosis by many persons who are affected by the disease.

Etiology of Depression and Suicidality

The cause of depression is multifactorial. A family history of depression is common among persons with the disorder, as is a family history of suicides.

In addition to depression, other factors such as alcohol/substance abuse (especially of opiates and cocaine), impulsiveness, and certain familial factors may greatly increase the risk for suicide. These include a past history of mental problems or substance abuse, suicide in the immediate family, family violence of any type, and separation or divorce.[6, 7, 8, 9, 10]

Other risk factors include prior suicide attempt(s), presence of a firearm in the home, incarceration, and exposure to the suicidal behavior of family members, peers, celebrities, or even highly publicized fictional characters. It is also established that the initiation of treatment for depression with psychotherapeutic agents can temporarily increase the incidence of suicidal ideation as well as energizing motivation, and therefore unfortunately can increase the likelihood of successful suicide attempts. The incidence of depression in healthcare workers is comparable to that in the general population, though the rate of completion of suicide is higher. Therefore, healthcare workers diagnosed with depression, especially when coupled with burnout or substance use disorder, should be considered to be a in higher risk category for attempted or completed suicide. 

Physiologic factors in depression

Depression is thought to involve changes in receptor-neurotransmitter relationships in the limbic system, as well as the prefrontal cortex, hippocampus, and amygdala. Serotonin and norepinephrine are thought to be the primary neurotransmitters involved, but dopamine has also been related to depression.

Typically, neurotransmitters are passed from neuron to neuron; subsequently, either they are reabsorbed into the neuron—where they are either destroyed by an enzyme or actively removed by a reuptake pump and stored until needed—or they are destroyed by monoamine oxidase (MAO) located in the mitochondria.

A decrease in the functional balance of these neurotransmitters causes certain types of depression (ie, decreased norepinephrine causes dullness and lethargy, and decreased serotonin causes irritability, hostility, and suicidal ideation).

Environmental factors, including coexisting illnesses or substance abuse, may affect neurotransmitters and/or have an independent influence on depression.

Alterations in the balance of neurotransmitters and/or their function include the following:

In addition to localizable brain chemical changes, it is likely that gene-environment interactions, as well as endocrine, immunologic, and metabolic mediators, play a part in the development of depression.[11]

Studies have revealed a strong link between depression and migraine with aura, which is explained at least in part by genetic factors.[12] In addition, a reciprocal link exists between obesity and depression.[13]

Bipolar disorder has a prominent depressive component but is a different clinical entity from depression. There is a possible defect on chromosome II or X, but current genetic research is inconclusive.

Antidepressants and suicide

In October 2003, the US Food and Drug Administration (FDA) issued a public health advisory regarding reports of suicidality in pediatric patients being treated with antidepressant medications for major depressive disorder. In September 2004, the results of an FDA analysis suggested that the risk of emergent suicidality in children and adolescents taking selective serotonin-reuptake inhibitors (SSRIs) was real. The FDA advisors—the Psychopharmacologic Drugs and Pediatric Advisory Committees—recommended the following:

The committees recommended, however, that the products not be contraindicated in the United States, saying that access to the drugs is important for patients who can benefit from them. For more information, see the FDA Statement on Recommendations of the Psychopharmacologic Drugs and Pediatric Advisory Committees.

Some studies have shown that the FDA warnings regarding suicide in children on antidepressants may have had the unintended result of a decrease in the rates of diagnosis and treatment of depression, as well as dosing adjustments by physicians. It has also been noted that monitoring of these patients did not increase following the warnings.[14, 15, 16, 17]

Epidemiology of Depression and Suicide

Occurrence in the United States

An estimated 6-12% of the US population will experience depression at some time. The annual suicide rate is 12.93 per 100,000 individuals. Suicide is the tenth leading of cause of mortality. In 2014, the total number of suicide deaths in the United States was 42,773.[3]

The Centers for Disease Control and Prevention (CDC) analyzed Behavioral Risk Factor Surveillance System (BRFSS) survey data from 2006 and 2008 and found that among 235,067 adults surveyed (in 45 states, the District of Columbia [DC], Puerto Rico, and the Virgin Islands), 9% met the criteria for current depression and 3.4% met the criteria for major depression.[18]

The study noted an increased incidence of depression in individuals without health insurance coverage versus those who had coverage (5.9% vs 2.9%, respectively); in individuals previously married (6.6%) or never married (4.1%) versus individuals currently married (2.2%); and individuals unable to work (22.2%) or unemployed (9.8%) versus homemakers and students (3%), individuals who were employed (2%), and retired persons (1.6%).

Individuals without a high school diploma (6.7%) and high school graduates (4%) were more likely to report major depression than were individuals who had attended at least some college (2.5%).

According to the CDC study, the age-standardized prevalence of major depression, "other depression," and any current depression varied by geographic location. The estimates for major depression ranged from 1.5% in North Dakota to 5.3% in Mississippi and West Virginia. Estimates of "other depression" were highest in Puerto Rico (10.2%), Mississippi (9.5%), and West Virginia (9.0%) and were lowest in North Dakota (3.2%), Oregon (3.6%), and Minnesota (3.8%). Estimates for current depression ranged from 4.8% in North Dakota to 14.8% in Mississippi and was mainly concentrated in the southeastern region of the United States.

Data from the National Health and Nutrition Examination Survey show that during 2009-2012, 7.6% of Americans aged 12 and over had depression (moderate or severe depressive symptoms in the past 2 weeks). Depression was more prevalent among females and persons aged 40-59. About 3% of Americans aged 12 and over had severe depressive symptoms.[19, 20]

International occurrence

In 2005, 1.4% of all deaths worldwide were attributed to suicide. The real number is unknown, since underreporting is predictably significant. In Eastern Europe, 10 countries report more than 27 suicides per 100,000 persons. Latin American and Muslim countries report the lowest rates, with fewer than 6.5 cases per 100,000.  However, strong cultural prejudice and stigma resulting from depression or suicide attempts in many countries predicts that these figures are gross underestimates. 

Race-related demographics

African Americans and Mexican Americans are least likely to receive any care, let alone adequate care, for depression.[2]

The BRFSS study by the CDC noted that non-Hispanic blacks (4%), Hispanics (4%), and non-Hispanic persons of other races (4.3%) were significantly more likely to report major depression than non-Hispanic whites (3.1%).[18]

Suicide rates among American Indian and Alaskan natives aged 15-34 years are almost twice the national average for this age range. Hispanic females make significantly more suicide attempts than their male or non-Hispanic counterparts.

The risk of suicide is increased by concurrent illness, alcohol and drug abuse, access to lethal means, hopelessness, pessimism, isolation, and impulsivity, and the risk is reduced by help-seeking behavior, access to psychiatric treatment, and availability of family and other social supports.

Sex-related demographics

More women than men seek treatment for depression, but this is not necessarily reflective of the true incidence of the disease. The BRFSS study by the CDC determined that women were significantly more likely than men to report major depression (4% vs 2.7%, respectively).[18]

Although depression is more often diagnosed in women, more men than women die as a result of suicide by a factor of 4.5:1. White men complete more than 78% of all suicides, with 56% of suicide deaths in males involving firearms. Poisoning is the predominant method among females.

An estimated 8-25 attempted suicides occur for every completion. Many of these are never discovered or never reported. It is critically important to recognize that the majority of suicide attempts are expressions of extreme distress in a very ill individual, and are categorically not, as has often been assumed historically, merely bids for attention.

Age-related demographics

According to the BRFSS study by the CDC, the prevalence of major depression increased with age, from 2.8% among individuals aged 18-24 years to 4.6% among individuals aged 45-64 years; however, incidence declined to 1.6% among those 65 years or older.[18] The study also found that "other depression" was highest (8.1%) among individuals aged 18-24 years.

Suicide is estimated to be the eighth leading cause of death in all age ranges in the United States. The highest suicide rates are found in men older than 75 years. However, suicide is also a selective killer of youth. It is the third leading cause of death among people aged 15-24 years, after unintentional injuries and homicide, and the second leading cause of death in college students. The mean age for successful completed suicides is 40 years.

Occupation-related demographics

Although no profession or occupation is immune to depression, it is recognized that certain occupations and professions may be more susceptible to depression and suicide, either because of pre-existing depressive tendencies upon entering the profession or occupation, or because of occupational hazards encountered. A 2014 claims-based survey of depression in industry analyzed rates for clinical depression in 55 industries and found that they ranged from 6.9 to 16.2%. Industries with the highest rates tended to be those that required frequent or difficult interactions with the public or clients, and had high levels of stress and low levels of physical activity.[21]  The medical profession has the highest risk of death by suicide of any profession or occupation for several reasons (see Physician Suicide). In all populations, the existence of depression coupled with knowledge of and access to lethal means dramatically increases the risk for suicide. In addition to medicine, other high control and highly regulated professions such as law enforcement, military, and the legal profession may be more likely to experience depression and less likely to seek intervention because of the associated stigma and possible licensure implications. Certain common conditions, such as PTSD in military, and burnout in healthcare providers,[22] may either be confused with or may contribute to the onset of depression. Recent research suggests that suicide is 3 times more likely in individuals who have experienced a concussion, so occupations that might result in head injuries may be predisposed to suicide, with or without concomitant depression.[23]


Morbidity associated with depression is difficult to quantify. The lethality of depression, however, in the form of completed suicide, can be measured, with suicide being the eighth leading cause of death in the United States.

As previously mentioned, 1.4% of all deaths worldwide in 2005 were attributed to suicide, although the true incidence may, as a result of underreporting, be significantly higher. Almost all people who kill themselves intentionally have a diagnosable mental disorder with or without substance abuse, which in itself is often a result of attempted self-treatment for the symptoms of depression. Approximately two thirds of individuals who complete suicide have seen a physician within a month of their death.

History and Physical Manifestations

Signs of depression in patient history

Depression is a pernicious and all-encompassing disorder that generally affects the body, feelings, thoughts, and behaviors to varying degrees.[24, 25, 26] However, the condition is often difficult to diagnose because it can manifest in so many different ways. For example, some depressed individuals seem to withdraw into apathy, while others may become irritable or even agitated. Eating and sleeping patterns can be exaggerated to either extreme, either becoming excessive or being almost eliminated. Observable or behavioral symptoms may be minimal despite profound inner turmoil. Symptoms of depression may include the following:

To establish a diagnosis of major depression, a patient must express 1 of the first 2 items above and at least 5 of the other symptoms listed. Such disturbances must be present nearly daily for at least 2 weeks. Symptoms can last for months or years.

Symptoms can cause significant personality changes and changes in work habits, as well as social withdrawal or consistent irritable moods, making it difficult for others to empathize with the depressed individual. Some symptoms are so disabling that they interfere significantly with the patient's ability to function. In very severe cases, people with depression may be unable to eat, take care of basic hygeine, or even to get out of bed.

Symptomatic episodes may occur only once in a lifetime or may be recurrent, chronic, or longstanding; in some cases, they seem to last forever. Occasionally, symptoms appear to be precipitated by life crises or other illnesses; at other times, they occur at random.

Clinical depression commonly occurs concurrently with, or can be precipitated by, injury or other medical illnesses and worsens the prognosis for these illnesses. Even the diagnosis of concurrent illness is made much more difficult by the presence of depression.

Physical manifestations of depression

There are no inevitable physical findings of depression, although some manifestations may be seen quite often. Signs of depression may include the following:

Differential Diagnosis of Depression

The differential diagnosis of depression contains numerous physical, emotional, and psychological disorders, including the following:

Laboratory and Imaging Studies

Laboratory studies

Depression is a clinical diagnosis. Laboratory tests are primarily used to rule out other diagnoses. Consider the following laboratory tests:

An electrocardiogram (ECG) may be indicated for the diagnosis of arrhythmia, particularly heart block. An electroencephalogram (EEG) also may be indicated in selected cases.

Imaging studies

Computed tomography (CT) scanning or magnetic resonance imaging (MRI) of the brain is performed if organic brain syndrome or hypopituitarism is included in the differential diagnosis.

Psychometric Tests

Certain psychometric tests can make a diagnosis of depressive disorders with reasonable clinical certainty. They include the following:

Emergency Department Treatment

Emergency department clinicians need to maintain a high index of suspicion for the diagnosis of depression, especially in populations at risk for suicide.[27, 28, 29]

The emergency department can sometimes be the last opportunity for intervention in the downward spiral of depression, which leads to death for a significant number of persons with the disease. Although the clinician may never see the results of protective intervention, statistics suggest that the presentation of a depressed and suicidal patient to a health-care setting is an opportunity to make a real difference and possibly to save a life.

Few diseases are as lethal, and yet as reversible, as depression. Lives can be and are saved every day as a result of the timely efforts and empathic interventions of skilled and compassionate health-care professionals who are knowledgeable, empathic, and motivated to deal effectively with depression.

Identifying at-risk patients

Although primary at-risk populations include young adults and elderly persons,[30] depression and suicidality can occur in any age group, including children.

Depression should be strongly suspected as an underlying factor in drug abuse or overdose (including alcohol) with self-inflicted injury or even in an intentionally inflicted injury by another in which the assailant is known to the victim. In any such patient, screening for diagnostic symptoms of major depression and suicidality is mandatory, in addition to protective custody. 

When a patient has contemplated or attempted suicide, the burden is on the health-care provider to directly explore the situation with the patient in as much detail as possible to determine the current presence of suicidal ideation as well as accessible means and plans for completion of suicide. Discussing these is the most important step emergency department clinicians can take in an attempt to prevent suicide in a patient at risk.

If suicidality is present, hospitalization with the patient's consent or via emergency commitment should be undertaken unless clear-cut means to assure the patient's safety can be assured while outpatient treatment is begun. A child who is suicidal or has made an attempt at suicide should be admitted to a protected environment until all medical and social services can be employed to ensure the child's safety and continued monitoring.

Treatment in the emergency department

Antidepressant therapy generally would not be initiated in the emergency department, although regional variations in this standard exist. A psychiatrist or mental health professional with prescribing privileges should be consulted for definitive pharmaceutical intervention. After consultation, it may be appropriate to provide a small amount of the suggested medication to sustain the patient until follow-up. It may also be appropriate to renew a previously effective medication in small quantities and with the assurance of a follow-up mechanism that is accessible and acceptable to the patient.

A fast-acting intervention in acute depression with suicidality that is currently being reviewed in the emergency medicine literature is the use of a low-dose intravenous bolus of ketamine.[31]

Psychotherapeutic interventions act synergistically with pharmacologic therapy. Guidelines for the treatment of patients with major depressive disorder have been updated by the American Psychiatric Association and are available on their Web site.[4]

Post–emergency department treatment

Patients may require additional interventions that can be instituted immediately on transfer from the emergency department, but never actually in the emergency department. Electroconvulsive therapy (ECT) is safe and can be quickly effective. It is usually reserved for refractory cases, cases of pharmacologic resistance or adverse effects, and cases in which rapid reversal is indicated. Newer treatment modalities for refractory depression, including electromagnetic transcranial stimulation and repetitive vagal stimulation, are becoming more widely available. For individuals who have previously been given a diagnosis and who have been successfully treated with these modalities, rapid reinstitution can be lifesaving.

Inpatient Care

When depression is diagnosed, particularly when suicidality is present or reasonably suspected, the primary care provider, often in consultation with a mental health professional, should design an interim disposition plan appropriate to the diagnosis and degree of risk that is assessed.

This may require legal certification that the patient is in need of emergency evaluation and protective observation, the provision of emergency or short-course medication, contracting for safety with the patient, and/or releasing the patient into the protective custody of his or her family or a law enforcement agency.

While evaluating and securing an appropriate disposition for the patient, all staff members must take measures to ensure the safety and preserve the dignity of the patient.

Transfer is indicated when there is a need for protective custody or intensive intervention that is not available at the present institution.

Consultations and Patient Education


Consult a mental health clinician after a screening evaluation is complete and all acute medical complications are addressed. The protocol for consultation should be established by the institution and should be the same for every patient with presenting symptoms of depression with suicidality.

Patient education

Patients must be told clearly and convincingly that depression is an eminently treatable illness. Carefully inform patients about the critical importance of taking any medications that are prescribed, as well as likely adverse effects and their management. Stress the need for short-term follow-up and continuing treatment.

Recommend reading for patients. A good source of information about depression is the National Alliance on Mental Illness.

For patient education information, see the Depression Center, as well as Depression, Suicidal Thoughts, Antidepressant Medications, and SSRIs and Depression.

Additional Treatment Considerations

Suicidality-associated treatment pitfalls include the following:


Louise B Andrew, MD, JD, Medical-Legal, Risk Management and Trial Consultant, Litigation Stress Counselor

Disclosure: Nothing to disclose.

Chief Editor

Barry E Brenner, MD, PhD, FACEP, Professor of Emergency Medicine, Professor of Internal Medicine, Program Director for Emergency Medicine, Sanz Laniado Medical Center, Netanya, Israel

Disclosure: Nothing to disclose.


Robert Harwood, MD, MPH, FACEP, FAAEM Program Director, Department of Emergency Medicine, Advocate Christ Medical Center; Assistant Professor, Department of Emergency Medicine, University of Illinois at Chicago College of Medicine

Robert Harwood, MD, MPH, FACEP, FAAEM is a member of the following medical societies: American Academy of Emergency Medicine, American College of Emergency Physicians, American Medical Association, Council of Emergency Medicine Residency Directors, Phi Beta Kappa, and Society for Academic Emergency Medicine

Disclosure: Nothing to disclose.

Dana A Stearns, MD Assistant Director of Undergraduate Education, Department of Emergency Medicine, Massachusetts General Hospital

Dana A Stearns, MD is a member of the following medical societies: American Academy of Emergency Medicine and American College of Emergency Physicians

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Medscape Salary Employment


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