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Alternative namesDepression - major; Unipolar depression; Major depressive disorder
Major depression is when 5 or more symptoms of depression are present for at least 2 weeks. These symptoms include feeling sad, hopeless, worthless, or pessimistic. In addition, people with major depression often have behavior changes, such as new eating and sleeping patterns. Major depression increases a person's risk of suicide.
Causes, incidence, and risk factors
The exact cause of depression is not known. Many researchers believe it is caused by chemical imbalances in the brain, which may be hereditary or caused by events in a person's life.
Some types of depression seem to run in families, but depression can also occur in people who have no family history of the illness. Stressful life changes or events can trigger depression in some people. Usually, a combination of factors are involved in the development of major depression.
Major depression is one of the most common chronic conditions. Each year, more than 18 million Americans -- men and women of all ages, races, and economic levels -- suffer from depression. It occurs more often in women.
Women are especially vulnerable to depression after giving birth. This is a result of the hormonal and physical changes that they have experienced. While new mothers commonly experience temporary "blues", depression that lasts longer than 2-3 weeks is not normal and requires treatment.
Major depression can occur in children and teenagers, and they can also benefit from treatment. (See also adolescent depression .)
SymptomsMajor depression is when a person has 5 or more of the following symptoms for more than 2 weeks:
Depression can appear as anger and discouragement rather than feelings of hopelessness and helplessness. If depression is very severe, it may be accompanied by psychotic symptoms, such as hallucinations and delusions. These are usually consistent with the depressed mood, and may focus on themes of guilt, personal inadequacy, or disease.
Signs and tests
Major depression is diagnosed if the person reports having 5 or more depressive symptoms for at least 2 weeks. Beck's Depression Scale Inventory or other screening tests for depression can be helpful in diagnosing depression.
Medical causes that can show symptoms of depression should also be ruled out before making the diagnosis of depression.
Depression can be treated in a variety of ways, particularly with medications and counseling. Most people benefit from a combination of the two. Some studies have shown that antidepressant drug therapy combined with psychotherapy appears to have better results than either therapy alone.
Medications include tricyclic antidepressants, monoamine oxidase inhibitors, selective serotonin re-uptake inhibitors (SSRIs), and some newer antidepressant drugs. While antidepressant medications can be very effective, some may not be appropriate for everyone. For example, paroxetine (Paxil) should NOT to be given to children under 18.
Lithium and thyroid supplements may be needed to enhance the effectiveness of antidepressants. For persons with psychotic symptoms, such as delusions or hallucinations, antipsychotic medications may be needed.
Electroconvulsive therapy (ECT) is a treatment that causes a seizure by means of an electrical current. ECT may improve the mood of severely depressed or suicidal people who don't respond to other treatments.
Research is now being conducted on transcranial magnetic stimulation (TMS), which alters brain functioning in a way similar to ECT, but with fewer side effects. Use of light therapy for depressive symptoms in the winter months and interventions to restore a normal sleep cycle may be effective in relieving depression.
As treatment takes effect, negative thinking diminishes. It takes time to feel better, but there are usually day-to-day improvements. It is important to maintain a healthy lifestyle. Eat well-balanced meals, avoid alcohol and drugs (which make depression worse and may interfere with medications), get regular exercise and sleep, and seek supportive interpersonal relationships.
Many consumers try herbal products for depression. St. John's wort has a long history of use in Germany and has gained popularity as an herbal antidepressant in the United States. Most of the German studies indicated that St. John's wort was comparable to some antidepressants. However, a large study conducted by the National Center for Complementary and Alternative Medicine found that St. John's wort was NOT effective for treating major depression.
Because herbal products can have side effects, always tell your doctor if you are using them.
For more information and resources, see depression support group .
The outcome is usually good with treatment. Although most depressive episodes can be effectively treated with either medication, psychotherapy, or both, depression is a recurring problem for many people. For people who have experienced repeated episodes of depression, maintenance treatment may be needed to prevent future recurrences.
Calling your health care provider
Call 911, a suicide hotline, or get safely to a nearby emergency room if you have thoughts of suicide , a suicidal plan, or thoughts of harming yourself or others.
Call your doctor right away if:
Some episodes of depression can be avoided by:
Counseling may help you through times of grief, stress, or low mood. Family therapy may be particularly important for teens who feel blue.
For elderly or others who feel socially isolated or lonely, try volunteering or getting involved in group activities.
Medications and psychiatric counseling may prevent recurrences. Some episodes of depression are not preventable.
Update Date: 2/26/2004A.D.A.M. editorial. Previously reviewed by Yvette Cruz, M.D., Department of Psychiatry, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network (2/17/2002).
Last updated: Tue, 06 Jan 2009 00:20:03 GMT