Muscle spasms Swelling Muscle weakness When to see the doctor Mild strains can be treated at home. See a doctor if your symptoms worsen despite treatment — especially if your pain becomes intolerable, or you experience numbness or tingling. Causes Acute strains can be caused by one event, such as using poor body mechanics to lift something heavy.

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Check with your doctor right away if you have dark urine, fever, muscle cramps or spasms, muscular pain, stiffness, tenderness, wasting or weakness, or unusual tiredness or weakness. Very rarely, statins can cause life-threatening muscle damage called rhabdomyolysis (rab-doe-my-OL-ih-sis). Rhabdomyolysis can cause extreme muscle pain, liver damage, kidney failure, and death. The risk of very serious side effects is extremely low.

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Only a few cases of rhabdomyolysis occur per million people taking statins. Myocarditis is inflammation of the heart muscle, called the myocardium. The condition can reduce the heart's ability to pump blood. Myocarditis can cause chest pain, shortness of breath, and rapid or irregular heartbeats. Infection with a virus is one cause of myocarditis.

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Sometimes myocarditis is caused by a medicine reaction or a condition that causes inflammation throughout the body. Overview Amyotrophic lateral sclerosis (a-my-o-TROE-fik LAT-ur-ul skluh-ROE-sis) is a nervous system disease that affects nerve cells in the brain and spinal cord. Also known as ALS, the disease leads to muscle weakness and gets worse over time. ALS often begins with muscle twitching and weakness in an arm or leg, trouble swallowing, or slurred speech. Eventually ALS affects the muscles needed ... Motor nerves that control muscle movement.

Autonomic nerves that control functions such as blood pressure, sweating, heart rate, digestion and bladder function. Symptoms of peripheral neuropathy might include: Gradual onset of numbness, prickling, or tingling in your feet or hands. These sensations can spread upward into your legs and arms. Fibroids contain more cells that estrogen and progesterone bind to than do typical uterine muscle cells.