Which term describes generalized muscle weakness?

Asthenia refers specifically to generalized muscle weakness or a lack of strength. It can occur in different clinical contexts, such as in neurological disorders, systemic diseases, or after prolonged illnesses. Asthenia is characterized by an overall feel of weakness rather than weakness localized to specific muscle groups.

On the other hand, hypotonia describes decreased muscle tone and can result in a "floppy" appearance of the muscles, but it does not inherently indicate generalized muscle weakness. Ataxia involves a lack of coordination and balance, primarily relating to movement and control rather than muscle strength itself. Spasticity indicates an abnormal increase in muscle tone, resulting in stiff or tight muscles, and is typically associated with upper motor neuron lesions. Thus, asthenia is the term that accurately captures the essence of generalized muscle weakness in this context.