Time and season, Doshas and season, Age, Sex, Regional factors, Occupational factors, Excessive, inadequate or abnormal use of sense and motor organs : Its Effect on Living creature
Psychological factors like fear and anger, which result in stress and sympathetic activity increases vata and pitta doshas in the body. On the other hand, joy or happiness that increases parasympathetic activity would result in increase in the kapha doshas in the body.