<unk> is a mental state of low mood and aversion to activity. Classified medically as a mental and behavioral disorder, the experience of<unk> affects a person's thoughts, behavior, motivation, feelings, and sense of well-being. The core symptom of<unk> is said to be anhedonia, which refers to loss of interest or a loss of feeling of pleasure in certain activities that usually bring joy to people. Depressed mood is a symptom of some mood disorders such as major depressive disorder or dysthymia; it is a normal temporary reaction to life events, such as the loss of a loved one; and it is also a symptom of some physical diseases and a side effect of some drugs and medical treatments. It may feature sadness, difficulty in thinking and concentration and a significant increase or decrease in appetite and time spent sleeping. People experiencing<unk> may have feelings of dejection, hopelessness and suicidal thoughts. It can either be short term or long term.
Depression 
Hypothyroidism
Late life depression
Malaise
Double depression
Autism spectrum  disorder  1
Mood disorder
Retarded depression