You are right in stating that use of synthyroid can lead to menstrual irregularities including increased bleeding,
however it is possible that your bleeding may also be related to an altered thyroid status (you would need to get a repeat Thyroid profile) or an unrelated cause (an Ob/Gy examination wll be needed).
Bottomline, You would need to discuss the case with your physician, and take a thyroid profile and Gynecologist opinion at the very minimum,
Please ACCEPT the reply, and give a BONUS if it was useful. If you
need more information, just let me know.
Regards
Dr. Gupta

