Yes, hyperthyroidism causes muscle problems. My doctor told me the increased metabolism is like flooring the gas pedal with the car in neutral. A lot of fuel is used, but we don’t go too far. Also, muscle tissue is often burned up by this excess metabolism, so there is less muscle to work with.
Many people notice weak thighs as a sign of hyperthyroidism. I remember before my diagnosis when I went hiking, and could not climb on a rock without feeling like I would fall. I thought at the time I must be getting old.
Hypothyroidism causes another set of muscle problems. I notice this first in my arms, with fatigue from light actions such as lifting my arms or trying to hold on to the steering wheel of a car or brush my teeth.
Dianne W
NGDF Asst. Online Facilitator