Muscle Weakness (Paresis)
Muscle weakness means loss of power, not simply tiredness. Sudden weakness—especially on one side—is an emergency.
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Quick Reference Facts
In simple words
Muscle weakness is reduced ability to move or hold a part of the body as usual. It is different from fatigue, which is a low-energy feeling without a clear loss of power.
Weakness may follow illness, injury, nerve or muscle problems, medicines, or metabolic conditions. Sudden or rapidly progressive weakness needs emergency assessment.
Common Causes
- Stroke or a transient ischaemic attack
- A nerve, spinal cord, muscle, or neuromuscular condition
- Illness, injury, medicine effects, or electrolyte changes
- A long-term neurological or muscle condition
Clinical Red Flags
Seek urgent medical attention at an emergency department or primary care clinic if you present with any of the following symptoms:
- Call emergency services for sudden face, arm, or leg weakness or numbness on one side, facial droop, speech difficulty, confusion, or sudden vision change—even if it settles.
- Seek emergency help for rapidly spreading weakness, weakness with breathing or swallowing difficulty, or new bladder or bowel control problems.
- Arrange prompt review for new, persistent, progressive, or function-limiting weakness.
Lifestyle & Diet Support
Do not force exercise through unexplained weakness or use supplements as a substitute for assessment. Note the onset, body parts affected, triggers, and associated symptoms to support a clinical review.
Frequently Asked Questions
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Differential Diagnosis Matrix
A clinician considers onset, one- or two-sided pattern, sensation, pain, speech or swallowing changes, breathing, injury, medicines, and other neurological symptoms.
Reference Citations & Evidence Sources
Clinical Guidelines & Consensus Statements
Clinical Reviews & Textbooks
- CIT-0023National Center for Complementary and Integrative Health. "Homeopathy: What You Need To Know." National Institutes of Health (2021).
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