There are many things that can cause
hair loss; however,
hair loss associated with being hypo, normally stops
and hair usually grows back, once thyroid levels are where they need to be.
Thyroid related hair loss is not a side effect of the medication; it's a symptom of being hypo. Some people do, however, report that once they begin taking medication, symptoms worsen for a while, as the body adjusts to having hormones its been doing without.