I was just diagnosed having hyperthyroidism,but I have been gainingt weight not losing, how come? It is not HYPO.

I am not sure but I do know that yo ucan experience weight gain after beginning treatment.

Try these sites for more info

http://www.endocrineweb.com/hyper1.html

http://www.merck.com/mrkshared/mmanual/section2/chapter8/8d.jsp

http://www.medicinenet.com/Hyperthyroidism/article.htm

Hope it helps!