If your thyroid
is not working correctly, your periods can be abnormal. After your thyroid responds to the treatment, the periods should go back to normal. If not, you might need further tests to check for other causes, such as hormone imbalances. Heavy or irregular bleeding can also happen with female conditions such as uterine fibroids or endometriosis
. I would recommend a pelvic examination by a specialist in gynecology for this possibility.
Hope I have answered your query. If you have any further questions I will be happy to help.