subjective feeling of being sick, ill, or not healthy. The feeling is generalized, varying from mild to severe in intensity. It may be the lone clinical manifestation of malaria, or may accompany other signs and symptoms, such as fever, headache, or nausea. This may be expressed as "feel achey all over," "flu-like symptoms," etc.
An indefinite feeling of debility or lack of health often indicative of, or accompanying, the onset of an illness. Post-exertional malaise â€“ feeling of debility following either physical or mental activities.