What are some health problems that can cause premature menapause? im only 31. symptoms already r hot flashes, breast tenderness, low fever, cold, ect

Many things: Anemia due to dietary issues or blood loss, thyroid disorder, anorexia - all can contribute. You need a thorough evaluation.

See your doctor: These symptoms can be due to a number of health conditions. You should be seen by both a primary care doctor and a gynecologist in order to get a thorough evaluation. An endocrinologist may be helpful. Best of luck to you.