any medication including thyroid medications can cause an allergic reaction such as hives. the incidence of hives with thyroid medication though is very low. however there is a known association between hives and thyroid antibodies. about a quarter of patients with long term hives (chronic urticaria) have antibodies to thyroid tissue and many of these patients are found to have low thyroid levels. the patients who had the worst hives were also the ones more likely to have antibodies to thyroid tissue. hives patients can also have antibodies to other immune mediated diseases such as lupus. unfortunately treating the thyroid condition does not eliminate the hives.
is there a link between continually hives and sythetic thyroid medications? . i just started to get hives on my body one day. the dermatologists did the removal of possible triggers and nothing helped. it has been about 3 and 1/2 yrs and i have to take antihistamine medications to keep them at bay. i also have hypothyroidism (for 15 yrs. ) and i heard synthetic medications may cause thyroid antibodies to react against the body causing the hives. has anyone seen this connection?