Muscle weakness means a loss of expected muscle force. It is a common symptom with many possible causes across different body systems. Below is a practical overview of how weakness is classified, common causes, urgent warning signs, and which medical specialties typically handle assessment.
Fatigue is a subjective sense of tiredness or low energy; weakness is an objective reduction in muscle force. Weakness may be focal (affecting one limb or muscle group) or generalized (widespread). The time course matters: sudden-onset weakness suggests emergency causes, while gradual or progressive weakness points to chronic conditions or muscle-specific disorders.
Causes include neurological problems (central or peripheral nervous system disorders), primary muscle diseases (myopathies), metabolic or electrolyte imbalances, endocrine conditions (for example thyroid disease), infections, and side effects of some medications. Inactivity, aging, and nutritional deficits can also contribute. A clinical assessment and tests are needed to determine the likely cause.
If weakness starts suddenly or is accompanied by trouble speaking or swallowing, difficulty breathing, chest pain, loss of consciousness, or high fever, seek immediate medical attention or emergency services. These are potential signs of serious conditions that require prompt evaluation. For non-urgent changes, contact your primary care provider for assessment.
Initial assessment often begins with primary care. Depending on findings, referrals may be made to Neurology, Physical Medicine and Rehabilitation, or Infectious Diseases and Clinical Microbiology, among others. Evaluation typically includes a medical history, focused physical exam, blood tests, possible electrodiagnostic studies (EMG), imaging, and targeted lab tests selected by the specialist.
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