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Nat'l Inst. of Health (36)

Muscle Disorders
Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.

Myasthenia Gravis
Myasthenia gravis interferes with messages your nerves send to your muscles. Myasthenia gravis often affects muscles in your head. Common symptoms are trouble with eye and eyelid movement, facial expression and swallowing. If you have myasthenia...

Myositis
Myositis is inflammation of your skeletal muscles, which are also called the voluntary muscles. These are the muscles you consciously control that help you move your body. An injury, infection or autoimmune disease can cause myositis.

Neuromuscular Disorders
Neuromuscular disorders affect the nerves that control your voluntary muscles. Voluntary muscles are the ones you can control, like in your arms and legs. Your nerve cells, also called neurons, send the messages that control these muscles. When the...

Pelvic Support Problems
A woman's organs can shift position as she ages. Pregnancy, childbirth or being too heavy can stretch and weaken muscles that support your pelvic organs. A sheet of muscles and ligaments called the pelvic floor supports the uterus, small intestine,...

Sciatica
Sciatica is a symptom of a problem with the sciatic nerve, a large nerve that runs from the lower back down the back of each leg. It controls muscles in the back of your knee and lower leg and provides feeling to the back of your thigh, part of your...

Shoulder Injuries and Disorders
Your shoulders are the most movable joints in your body. They can also be unstable because the ball of the upper arm is larger than the shoulder socket that holds it. To remain in a stable or normal position, the shoulder must be anchored by...

Tendinitis
Tendons are the tough cords of tissue that attach muscles to bones. They help your muscles move your bones. Tendinitis means inflammation of a tendon. It causes pain and tenderness near a joint. It usually occurs in the shoulders, elbows, knees,...

Testicular Disorders
Testicles, or testes, make male hormones and sperm. They are two egg-shaped organs inside the scrotum, the loose sac of skin behind the penis. It's easy to injure your testicles because they are not protected by bones or muscles. Men and boys should...

Thoracic Outlet Syndrome
If you have thoracic outlet syndrome (TOS), the nerves or blood vessels just below your neck are compressed, or squeezed. It can be between the muscles of your neck and shoulder or between the first rib and collarbone. You may feel burning, tingling...