Muscle and Joint Pain

Hypothyroidism and hyperthyroidism can cause a variety of muscle or joint-related symptoms. Both hypothyroidism and hyperthyroidism are known to cause what are called myopathies—the medical term for diseases that affect skeletal muscle.

Skeletal muscles are the muscles connected to your bones. An example of skeletal muscles are your biceps in the upper arm, or the quadriceps in the thigh.

Myopathies most often are seen in what are known as the proximal muscles.

These are the muscles that are closest to the center of the body, such as the thigh or shoulder.

In myopathies caused by inflammation or metabolic conditions, such as autoimmune thyroid disease, white blood cells may attack parts of the muscle and the surrounding blood vessels, or abnormal levels of certain biochemical substances end up accumulating in your muscles, leading to weakness or pain.

Different thyroid conditions can also be associated with particular types of muscle and joint problems.

Muscle and Joint Pain With Hypothyroidism
Hypothyroidism can create a variety of muscle and joint-related symptoms. Most commonly, these symptoms are due to swelling of muscles, or swelling muscles that are pressing on nerves. Some of the problems seen include:

general muscular weakness and pain, including cramps, and stiffness
general joint pain, achiness, stiffness, known as “arthropathy”
tendonitis in the arms and legs
carpal tunnel syndrome, which involves pain, tingling, weakness, achiness, or numbness in the wrist, fingers, or forearm. It is due to swelling of membranes that compress a nerve in the forearm.
tarsal tunnel syndrome—similar to carpal tunnel, with pain, tingling, burning, and other discomfort in the arch of your foot, the bottom of the foot, possibly extending into the toes.