My personal, completely non-medical opinion is: sure, it could be any of those.
Except for the typhoid problem, those styles of balding are not a health issue, from what I know of them. They just are patterns of balding.
If you think this is a health related symptom, then don't act like most of us with the Y chromosome tend to do in such a situation and do nothing. Get yourself to the doc and tell him/her of your concerns.