Hashimoto's Hypothyroidism and Dermatomyositis

I was diagnosed with Hashimoto's hypothyroidism in May 2015 and began levothyroxine treatment. About the same time I developed muscle weakness, skin rashes and began to lose weight. These symptoms accelerated during the autumn and in December I was diagnosed with dermatomysositis. Fortunately no malignancy has been found so far and both conditions are responding to treatment. I should be interested to hear from anyone with experience of dermatomyositis associated with Hashimoto's hypothyroidism and what the longer term prognosis may be. I am 69 and male.

2 Replies

  • Michaeloxon, muscle weakness is common in hyperthyroid and hypothyroid patients and will usually improve when thyroid levels are optimal. There aren't many posts on dermatomyositis on TUK but there are some in other communities in the link below.


  • Thank you Clutter. The consultant diagnosed dermatomyositis because of the skin rashes, especially the diagnostic one on the back of the finger joints. This didn't itch but I had severe itching on the back, chest, neck and scalp. It was like eczema that didn't respond to the normal ointment treatments. I had a very high ANA level of 1:2560 in early November. I am glad you say muscle weakness is common in conjunction with hypothyroid conditions because the consultant was sceptical about this and looked for a malignancy cause as there is a 20-25% association with this, higher in the elderly. The weakness is already better as I have been on 125 mcg levothyroxine for several months now after going up to 150 and back down again. TSH was at 58 before diagnosis in May. So it could well be that varying the thyroxine level sparked the myositis off. Thank you for your help.

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