system
What causes change in behavior and character frequently?
human
Dear sir, I am kalaiselvan, here to speak regarding my father's mentally disorder character. He never go to any work from his birth. He is 60 year old. He wil be like a normal person for a year in this period he never do any work, he will eat whatever avilable in home and take sleep in hearby temple, then next year his character totally  changed, In this period he never sleep in night, roaming in street, and always quarrel with our family mebber. We can't identified what type of disease this.
gpt
Hi dear,your father might have Bipolar mood disorder.in this disorder there is changes of mood in two extremes of pole.so  during manic period he might be happy or irritable and in depressive phase he does not talk much.so for detail history consult local psychiatrist and discuss.Is there any history of substance intake?any family history of psychiatric illness?Thank you