Depression may be caused by major events in life, such as death or childbirth or other significant events. Illnesses, drinking alcohol, taking drugs and some medications may also cause depression. These may cause a chemical imbalance in the brain, which may be responsible for some cases of depression. Depression may also run in families, as people with a family history of depression may be more likely to develop depression as well.

Symptoms of depression may include thinking or speaking slower than usual, trouble concentrating, difficulty making decisions, forgetfulness, changes in eating habits, a loss of interest in hobbies, changes in sleeping habits, feelings of guilt or hopelessness, suicidal thoughts, thoughts of death, headache and stomachaches. These symptoms may cause problems in the patient's social life, professional life and in relationships.

Depression may significantly reduce the quality of life in some patients. A family member, friend or the patient may notice these symptoms and seek the advice or help of a doctor. Depression may be overlooked for months or years, so recognizing the symptoms of depression may be very important in identifying the condition before it becomes a more serious problem.

Depression may be treated through counseling or talking to a psychiatrist. Antidepressant medications may also be prescribed to help patients with depression.

Treatment may take weeks to be effective and it may take a few changes in the treatment regimen before the correct treatment or combination of treatments is found. Mild cases of depression may be treated with the help of a psychologist, but in severe cases, a psychiatrist may be helpful, as a psychiatrist may prescribe drugs to further help the patient.

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