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Muscle weakness happens when your full effort doesn’t produce a normal muscle contraction or movement. It’s sometimes called reduced muscle strength, muscular weakness, or weak muscles.


Many diseases can cause extreme fatigue and weakness. According to MedlinePlus, a service of the U.S. National Library of Medicine and the National Institutes of Health, fatigue is a feeling of weariness, tiredness or a lack of energy, and fatigue is different from drowsiness.


There are 82 conditions associated with fatigue and muscle weakness. The links below will provide you with more detailed information on these medical conditions from the WebMD Symptom Checker and help provide a better understanding of causes and treatment of these related conditions.


All of us at some point in our life have experienced reduced power and tiredness bordering on fatigue. What causes this? This is a common complaint called muscle weakness. As the name suggests, it ...


Muscle weakness in legs and hips occurs either as a sensation or if your muscles are fatigued enough that they lose strength. If you are experiencing a sudden weakness in your legs it may be attributed to a more serious condition.


Muscle weakness is a common complaint but the word weakness has a wide range of meanings, including tiredness, reduced power and failure to work at all. There is an even wider range of possible causes. This shows itself as an inability to perform what you want to do with a muscle, even the first ...


Causes of Muscle weakness. Muscle weakness may be caused by a variety of diseases and conditions, including low sodium or potassium, amyotrophic lateral sclerosis, cerebral palsy, multiple sclerosis, pinched nerve, muscular dystrophy and poisoning.


Allergic rhinitis is a common cause of chronic fatigue. But allergic rhinitis often can be easily treated and self-managed. To make a diagnosis, your doctor will assess your symptoms. The doctor ...


The most common causes of muscle pain are tension, stress, overuse and minor injuries. This type of pain is usually localized, affecting just a few muscles or a small part of your body. Systemic muscle pain — pain throughout your whole body — is more often the result of an infection, an illness or a side effect of a medication.


Weakness may be generalized or may affect one muscle or muscle group exclusively. Diseases of the neuromuscular system, injuries, metabolic diseases, and toxins can all cause of measurable muscle weakness. Signs and symptoms of weakness can include trouble doing daily tasks, such as grooming or writing or problems with gait and loss of balance.