<unk> , or PTD is an affective, or mood, disorder. Most PTD victims experience high levels of depression upon returning from a vacation or a place away from their ordinary lives. In most cases, PTD is short lived and sufferers return to normal stages in accordance to time spent away.
Post travel depression
Post stroke depression
Depression in elderly
Depression 
Depression in adolescents
Clinical depression
Major depressive disorder risk factors
Schizophrenia risk factors