Causes of Muscle Weakness, Muscle Fatigue, Weak Muscles, No Strength
Muscle weakness is the reduction in the strength of one or more muscles. Muscle fatigue is the reduced ability to generate force. Succinctly, weak muscles makes you feel like you have no strength.
Muscle weakness is a physical manifestation of fatigue. Your feeling of no strength may be generalized or central, for which all of your muscles feel weak. Or you may have localized or peripheral muscle fatigue on one side, only in a limb or just a muscle.
Weak muscles may result from a variety of health conditions typically caused by autoimmune, endocrine, metabolic, neurological, neuromuscular and muscular disorders, infections and toxins, such as:
- ALS
- polio
- stroke
- anemia
- leprosy
- botulism
- lipidoses
- Bell’s palsy
- myopathies
- malnutrition
- fibromyalgia
- polymyositis
- hypokalemia
- renal acidosis
- cerebral palsy
- celiac disease
- Rett syndrome
- lead poisoning
- food poisoning
- mononucleosis
- cardiomyopathy
- dermatomyositis
- multiple sclerosis
- myasthenia gravis
- Addison’s disease
- mercury poisoning
- muscular dystrophy
- hyperparathyroidism
- respiratory infections
- Huntington’s disease
- pinched, injured nerve
- Guillain-Barre syndrome
- glycogen storage disease
- chronic fatigue syndrome
- Charcot-Marie-Tooth disease
- hypothyroidism, hyperthyroidism
- neuropathy ~ peripheral, diabetic
- electrolyte imbalance ~ low sodium, potassium
Some of these causes for weak muscles may be brought to you with other symptoms, like:
- fever
- atrophy
- diarrhea
- vomiting
- paralysis
- hypotonia
- headaches
- weight loss
- paresthesias
- vision changes
Laxative overuse, alcoholism, statins, lithium and long term use of corticosteroids, such as prednisone, may contribute to muscle fatigue as well.
Muscle weakness is an expected result of vigorous exercise, an eating disorder, no appetite or fasting. But what isn’t normal is having no strength after performing typical daily tasks without these influences.
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