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 Min Clinic Staff | 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).