I have Hypothyroid with hashimoto s disease, my period s are absent without thyroid medication, and continuous with it. what s the problem ? I was on 137mcg and when I continually took my thyroid, it s like my period wouldn t end. It was mostly very light, but sometimes like what i would guess a regular period is like. I ve never had a regular period. If I stop my thyroid medication, my period disappears completely.