Amedical term for abnormal, involuntary, spasmodic movements is:

A medical term for abnormal, involuntary, spasmodic movements is dyskinesia.
Any type of involuntary movement falls under the category of dyskineasia - twitches, tics, chorea, slight tremors, or uncontrollable movement of any part of your body. There are many causes of this disorder, and it usually cannot be treated without medications.

Depression is lifelong, though you can get medication to with it. the difference between sadness and depression is that sadness lasts a little bit, depression last a long time and it goes on and off. people usually get depression through experiences they have been through, or genetics.