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Definition:

Weakness is a reduction in the strength of one or more muscles.



Alternative Names:

Lack of strength; Muscle weakness



Considerations:

Weakness may be generalized (total body weakness) or localized to only one area, side of the body, limb, or muscle. Weakness is more notable when it is localized. Localized weakness may follow a stroke , flare up of multiple sclerosis , or injury to a nerve.

Weakness may be subjective or objective.

  • Subjective means you feel weak, but there is no measurable loss of strength.
  • Objective means there is a measurable loss of strength noted during a physical exam.

A subjective feeling of weakness may be associated with infectious diseases such as mono and the flu .



Common Causes:

Measurable weakness may result from a variety of conditions including metabolic, neurologic, primary muscular diseases, and toxic disorders.

METABOLIC

NEUROLOGIC

PRIMARY MUSCULAR DISEASES

TOXIC

OTHER



Home Care:

Follow prescribed therapy for treating the underlying cause of the weakness.



Call your health care provider if:

Call your doctor if you have:

  • Prolonged, unexplained weakness
  • Sudden weakness, particularly when it is in one area and not accompanied by other complaints, such as fever
  • Sudden weakness following a viral illness
  • Weakness in one area of the body


What to expect at your health care provider's office:

The doctor will examine you and ask questions about your medical history and symptoms, such as:

  • Time pattern
    • When did the weakness begin?
    • Did it begin with an illness or injury?
    • Did it occur suddenly or gradually?
    • Is the weakness worse in the morning or at night?
    • Is the weakness noticed only after strenuous activity or exercise?
    • Did it start following a typical viral illness, such as a cold?
    • Did it start after a vaccination?
  • Quality
    • Is the weakness constant or does it come and go, sometimes effecting different parts of your body?
    • Does the weakness affect breathing?
    • Does it affect talking, chewing, or swallowing?
    • Does it affect walking, climbing stairs, sitting, getting up?
    • Does it affect use of the hands, arms, or shoulders?
    • Is there pain with the weakness?
    • Is there numbness or tingling with the weakness?
  • Location
    • Is the weakness limited to a specific area?
    • Has the area of weakness increased or decreased?
  • Aggravating factors
    • What makes the weakness worse?
  • Relieving factors
    • Does anything help relieve the weakness?
      • Rest
      • Eating
      • Pain relief
  • Other symptoms
  • Additional important information
    • What medications do you take?
    • Do you have any allergies ?

Physical examination may include special attention paid to examination of heart, lungs, and thyroid gland. If there is a local area of weakness, the examination will focus on the nerve and muscle functions.

Diagnostic tests that may be done include:



Prevention:



References:

Olney RK. Weakness, Disorders of Movement, and Imbalance. In Kasper DL, Braunwald E, Anthony S. Fauci AS, eds. Harrison’s Internal Medicine. 16th ed. New York, NY: McGraw-Hill; 2005.




Review Date: 7/17/2007
Reviewed By: Robert Hurd, MD, Professor of Endocrinology, Department of Biology, Xavier University, Cincinnati, OH, and physician in the Primary Care Clinic, Cincinnati Veterans Administration Medical Center, Cincinnati, Ohio. Review provided by VeriMed Healthcare Network.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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Wentworth-Douglass Hospital
789 Central Avenue, Dover, NH 03820
Phone: (603) 742-5252
Toll free: 1 (877) 201-7100