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According to WebMD, the main causes of depression include physical, sexual or emotional abuse, death of a loved one, serious illness, substance abuse, and family history of depression or mental illness. A major life even... More »

www.reference.com Health Conditions & Diseases Mental Health

Depression is a common but serious medical condition that negatively affects a person's mood, energy levels, concentration and overall outlook on life, according to the National Institute of Mental Health. There are diff... More »

www.reference.com Health Conditions & Diseases Mental Health

A doctor performs a complete psychological and physical evaluation along with an interview to determine whether a person has depression, notes MedicineNet. Because the side effects of some medications and medical conditi... More »

www.reference.com Health Conditions & Diseases Mental Health
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If substance abuse is not treated in an individual with bipolar disorder, mood swings between mania and depression are hard to manage, a diagnosis of bipolar disorder is difficult, and medications used to treat the menta... More »

www.reference.com Health Conditions & Diseases Mental Health

Factors that contribute to auditory hallucinations include mental illness, substance abuse, lack of sleep and medications, according to Healthline. Some specific disorders associated with auditory hallucinations include ... More »

www.reference.com Health Conditions & Diseases Mental Health

Symptoms of mental illness include alcohol or drug abuse, mood disorders, problems with concentration and thinking, and nervousness, according to Mayo Clinic. Hallucinations, delusions, social withdrawal, excessive tired... More »

www.reference.com Health Conditions & Diseases Mental Health

An individual with dissociative identity disorder, or DID, may experience emotional and neurological symptoms such as depression, memory loss, anxiety attacks, delusions, suicidal thoughts, eating disorders, headaches an... More »

www.reference.com Health Conditions & Diseases Mental Health