The most common symptoms of depression that are noticeable to others are increased sadness that doesn't go away, decreased interest or enjoyment in activities that have previously been enjoyed, excessive sleeping or insomnia, increased and ongoing fatigue or tiredness, changes in appetite (usually decreased), increased irritability, crying spells for no reason, increased agitation and restlessness, decreased concentration, and an increase in physical ailment complaints. You might also notice feelings of hopelessness and helplessness, feelings of self loathing or decreased self worth, and increased thoughts of death and dying.