Can Thyroid Medication Cause Joint Pain?

Thyroid medications may be associated with joint pain if the dose is too high, too low, or the patient is reacting to the particular formulation. Both levothyroxine and liothyronine may trigger muscle and joint discomfort in approximately 2-5% of patients. This occurs most commonly when starting treatment or adjusting doses, as your body adapts to changing hormone levels. The pain typically affects large joints like knees, hips, and shoulders, and may be accompanied by stiffness or muscle pain and weakness. Most joint pain from thyroid medication is temporary and resolves within 4-6 weeks as your body adjusts. Some joint pain may be part of autoimmune thyroid disease itself, independent of treatment. Persistent or severe joint pain should be evaluated by your healthcare provider.