Muscle involvement is a common manifestation of both clinical and subclinical hypothyroidism. with serum creatine kinase (CK) elevation being probably the most common manifestation. and is seen in up to 90% of patients. but is usually mild (less than 10 times the upper limit of normal). https://www.roneverhart.com/Baby-Gee-Moxxie-2-1x2-1/