i would say an endocrinologists or a doctor that specializes in internal medicine. the cause of rapid weight gain can be from any number of causes so it is hard to tell.
what kind of doctor should i see? . i have gainedy 50 pounds since march 2012 all in my belly area with no change in my eating or exercise habits. my pcp telsl me i need to exercise more however i know my body and i know there is something wrong. i know that carrying weight in my mid-section is not healthy and no one seems to care much about it. i sometimes get pains on each side and my pelvic ultrasouds are fine. please give me some direction as to what type of physician i can see to help diagnose this problem. thanks!