What to do if i have hyperthyroidism and have gained 35 pds. why?

Regained lost weight: Many patients with hyperthyroidism lose a lot of weight (often 20-40 lbs) before they are diagnosed because the high thyroid hormone levels speed up your body's metabolism so much. So once you start treatment and your thyroid levels return to normal, it is common to regain all or most of the weight lost. In fact, some patients gain more weight than they lost, so watching what you eat is key.