What causes nervousness, restlessness and some tremors while on Levothyroxine?

Posted on Wed, 10 Jun 2015 in General Health
Question: Started on Levothyroxine three months ago 25mcg. Having a tremendous problem with nervousness, restlessness, some tremors. Suddenly wondered today whether it may be causing these issues and checked here on drugs.com. Seems like that's a possibility. Am I correct?
Answered by Dr. Panagiotis Zografakis 9 minutes later
Brief Answer:
It could be

Detailed Answer:

although 25mcg is a very low dose, I can't exclude it because the symptoms you've mentioned could be attributed to hyperthyroidism. The best way to check whether this could be true or not is to check your blood thyroid stimulating hormone (TSH) and perhaps also your free T4. If your TSH is normal then you should not worry about the pill and you should look elsewhere for the cause of your symptoms.

Other symptoms of hyperthyroidism include a fast heart rate, weight loss, sweating, intolerance to heat, diarrhea, etc
Not every symptom has to occur of course but a fast heart rate is very common.

I hope I've helped!
Kind Regards!
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
Answered by
Dr. Panagiotis Zografakis

Internal Medicine Specialist

Practicing since :1999

Answered : 3680 Questions


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