Causes of Suicide

Depression: Medical causes

Organic disorders: Various organic disorders and chronic illnesses produce mild, moderate, or severe depression. Among these are metabolic and endocrine disorders,such as hypothyroidism, hyperthyroidism, and diabetes; infectious diseases, such as influenza, hepatitis, and encephalitis; degenerative diseases, such as Alzheimer's disease, multiple sclerosis, and multi-infarct dementia; and neoplastic disorderssuch as cancer.

Psychiatric disorders: Affective disordersare typically characterized by abrupt mood swings from depression to elation (mania) or by prolonged episodes of either mood. In fact, severe depression may last for weeks. More moderate depression occurs in cyclothymic disordersand usually alternates with moderate mania. Moderate depression that's more or less constant over a 2-year period typically results from dysthymic disorders. Also, chronic anxiety disorders,such as panic and obsessive-compulsive disorder, may be accompanied by depression.

Other causes

Alcohol abuse: Long-term alcohol use, intoxication, or withdrawal commonly produces depression.

Drugs:Various drugs cause depression as an adverse effect. Among the more common are barbiturates; chemotherapeutic drugs, such as asparaginase; anticonvulsants, such as diazepam; and antiarrhythmics, such as disopyramide. Other depression-inducing drugs include centrally acting antihypertensives, such as reserpine (common in high dosages), methyldopa, and clonidine; beta-adrenergic blockers, such as propranolol; levodopa; indomethacin; cycloserine; corticosteroids; and hormonal contraceptives.

Postpartum period: Although the cause hasn't been proved, depression occurs in about 1 in every 2,000 to 3,000 pregnancies and is characterized by various symptoms. Symptoms range from mild postpartum blues to an intense, suicidal, depressive psychosis.

Source: http://www.wrongdiagnosis.com/s/suicide/causes.htm