Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.

Definition of Asthenia

Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026

Asthenia: Weakness. Lack of energy and strength. Loss of strength. Myasthenia refers to a loss of muscle strength, as in myasthenia gravis.

Asthenia is from the Greek asthenes, from a- (without) + sthenos (strength).

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