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Muscle function loss occurs when your muscles don’t work or move normally. Complete muscle function loss, or paralysis, is a complete loss of muscle function, in which you can’t contract your muscles normally.
If your muscles lose function, you won’t be able to properly operate the affected parts of your body. This symptom is often the sign of a serious problem in your body, such as a severe injury, drug overdose, or coma. A loss of muscle function can be permanent or temporary. However, all instances of muscle function loss should be treated as a medical emergency.
The loss of muscle function can be either partial or total. Partial muscle function loss only affects a part of your body. This is the main symptom in stroke victims. Total muscle function loss, or paralysis, affects your entire body. It’s often seen in people with severe spinal cord injuries.
If a loss of muscle function affects both the top half and bottom half of your body, it’s called quadriplegia. If it affects only the bottom half of your body, it’s called paraplegia.
A loss of muscle function is often caused by a failure in the nerves that send signals from your brain to your muscles and cause them to move.
When you’re healthy, you have control over muscle function in your voluntary muscles. Voluntary muscles are skeletal muscles over which you have full control. Involuntary muscles, such as your heart and intestinal smooth muscles, aren’t under your conscious control. However, they too can stop functioning. The loss of function in involuntary muscles can be fatal.
A loss of voluntary muscle function can be caused by a number of things, including diseases affecting your muscles or nervous system.
Diseases that directly affect the way your muscles function are responsible for most cases of muscle function loss. Two of the more common muscle diseases that cause muscle function loss are muscular dystrophy and dermatomyositis. Muscular dystrophy is a group of diseases that cause your muscles to become progressively weaker. Dermatomyositis is an inflammatory disease that causes muscle weakness, as well as a distinctive skin rash.
Diseases that affect the way your nerves transmit signals to your muscles can also cause muscle function loss. Some nervous system conditions that cause paralysis are:
Many of the diseases that cause a loss of muscle function are hereditary and present at birth.
Severe injuries also account for a large number of paralysis cases. For example, if you fall from a ladder and injure your spinal cord, you may experience a loss of muscle function.
Long-term drug use and medication side effects can also cause muscle function loss.
Before prescribing any treatment, your doctor will first diagnose the cause of your muscle function loss. They’ll start by reviewing your medical history. The location of your muscle function loss, the parts of your body affected, and your other symptoms all give clues regarding the underlying cause. They may also conduct tests to assess your muscle or nerve function.
Let your doctor know if your loss of muscle function came on suddenly or gradually.
Also, mention the following:
After conducting a physical examination and reviewing your medical history, your doctor may administer tests to see if a nerve or muscle condition is causing your loss of muscle function.
These tests might include the following:
Treatment options are tailored to your particular needs. They may include:
In some cases, your symptoms will clear with treatment. In other cases, you may experience partial or complete paralysis, even after treatment.
Your long-term outlook depends on the cause and severity of your loss of muscle function. Talk to your doctor to learn more about your condition and outlook.
Some causes of muscle function loss are difficult to prevent. However, you can take steps to lower your risk of stroke and avoid accidental injury:
Written by: April Kahn
Medically reviewed on: Feb 25, 2016: William A. Morrison, MD
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