Major Depression unipolar (only a depressed mood as opposed to bipolar - depressed and manic moods) single episode or chronic (lasting more than 6 months) This results from a chemical imbalance in the brain (neurotrasnmitters - seratonin, norepinepherine, dopamine)
Depressed mood- This is not the result of an environmental event such as divorce, job loss, death of a loved one, etc.
Difficulty falling or staying asleep
Decreased social interaction
Decreased sex drive
Difficulty concentrating resulting in memory problems