The phrase "asthenia" is correct and usable in written English.
It is typically used in medical contexts to refer to a condition of weakness or lack of energy.
Example: "The patient reported experiencing asthenia, which made it difficult for her to perform daily activities."
Alternatives: "fatigue" or "weakness".
It is a form of local sensitivity to cold and is frequently seen in mentally or emotionally disturbed people or in those with neurocirculatory asthenia (a symptom-complex in which there is breathlessness, giddiness, a sense of fatigue, pain in the chest over the heart, palpitation, and a fast and forcible heartbeat of which the affected person is conscious).
Neurocirculatory asthenia is a clinical syndrome characterized by breathing difficulties, heart palpitations, a shortness of breath or dizziness, and insomnia.
General asthenia occurs in many chronic wasting diseases, such as anemia and cancer, and is probably most marked in diseases of the adrenal gland.
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But his targets also included the diagnostic terminology favored by the medical nosology of the day most prominently, "asthenia" (and its cognate notions) and, as already mentioned, "vital force".
Asthenia may be limited to certain organs or systems of organs, as in asthenopia, characterized by ready fatigability of vision, or in myasthenia gravis, in which there is progressive increase in the fatigability of the muscular system.
Asthenia, a condition in which the body lacks or has lost strength either as a whole or in any of its parts.
