I had thyroid cancer in 2003 I have been doing good and am cancer free I have been on synthroid from then till now at this time I am taking 137mcg synthroid  for  A while now of and on I have been having tingling feeling in my face and the top of my head and feel tired and sometimes slow and foggy feeling - could this be a side affect from synthroid after this long
Hi and welcome to Chat Doctor, thank you for your query. Yes it can be one of the side effects of Synthroid, but also it can be signed of hyper-hypothiroidism so check your hormonal levels as soon as you can. Other possible causes are some neuralgia or psychosomatic diseases and serious diagnoses are rare. So if symptoms persist consult neurologist or consider to change Synthroid dosage in consultation with your doctor. Wish you good health. Regards.