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Muscle Spasms

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Muscle spasm facts

  • Spasms may affect many different types of muscles in the body, leading to many different symptoms and presentations.
  • Spasms of skeletal muscles are most common and are often due to dehydration and electrolyte abnormalities. The spasm occurs abruptly, is painful, and is usually short lived. It may be relieved by gently stretching the muscle.
  • If muscle spasms are especially painful, if they do not resolve or if they recur, medical care should be accessed to look for potential underlying causes.
  • Smooth muscles that are within the walls of hollow organs can go into spasm, causing significant pain. Often this pain is colicky, meaning that it comes and goes. Examples include the pain associated with menstrual cramps, diarrhea, gallbladder pain, and passing a kidney stone.
  • A special form of muscle spasms are the dystonias where an abnormality perhaps exists with the chemicals that help transmit signals within the brain. Examples include torticollis and blepharospasm. Treatment may include medications to help restore the neurotransmitter levels to normal and Botox injections to paralyze the affected muscle and relieve the spasm.

What is a muscle spasm?

A muscle spasm, or muscle cramp, is an involuntary contraction of a muscle. Muscle spasms occur suddenly, usually resolve quickly, and are often painful.

A muscle spasm is different than a muscle twitch. A muscle twitch, or fasciculation, is an uncontrolled fine movement of a small segment of a larger muscle that can be seen under the skin.

Muscles are complex structures that cause movement in the body. There are three types of muscle in the body:

  • Heart muscle pumps blood (cardiac muscle).
  • Skeletal muscle moves the external body parts, like the arms and legs, neck, back, trunk, and the face.
  • Smooth muscle moves portions of hollow structures inside the body. Examples include the muscles that line the esophagus, stomach, and intestines, muscles that line large arteries, and the muscles of the uterus.

Skeletal muscles are anchored to bone, either directly or by a tendon. When the muscle contracts, the associated body part moves. This allows arms to lift, legs to run, and the face to smile. Most of these muscles are under willful or conscious control of the brain. This type of muscle is striated or striped with dark-colored muscle fibers containing large amounts of myoglobin, the protein that helps carry oxygen and light-colored fibers that have lesser amounts of the protein. The contraction of a skeletal muscle requires numerous steps within its fibers and cells. The nutrients required to produce energy, oxygen, electrolytes, and glucose are supplied by the bloodstream.

Smooth muscle is located in the walls of hollow internal structures in the body, like the arteries, intestines, bladder, and iris of the eye. They tend to circle the structure and when they contract, the hollow structure is squeezed. These muscles are involuntary and are controlled by the unconscious part of our brain function using the autonomic nervous system. The autonomic nervous system can run in the background, regulating body processes within the body. There is a balance between the sympathetic system (adrenergic nerves) that speed things up and the parasympathetic system (cholinergic nerves) that slow things down. These names are based on the type of chemical that is used to transmit signals at the nerve endings. Adrenaline (epinephrine from the sympathetic nervous system) allows the body to respond to stress. Imagine seeing a bear in the woods; your heart beats faster, your palms get sweaty, your eyes dilate, your hair stands on end, and your bowels move all because the sympathetic nervous system is activated. Acetylcholine is the chemical that is the anti-adrenaline and is involved in the parasympathetic nervous system that acts to calm us down. Smooth muscle has the same basic contraction mechanism as skeletal muscle, though different proteins are involved.

Medically Reviewed by a Doctor on 7/17/2013

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Source: MedicineNet.com
http://www.medicinenet.com/muscle_spasms/article.htm

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