If you have generalized weakness and fatigue along with other symptoms, evaluate those symptoms. Home treatment for your other symptoms usually will improve your weakness and fatigue. Mild generalized weakness and fatigue that occur with a viral illness usually improve with the following home treatment measures.
Get extra rest while you are ill. Let your symptoms be your guide.
If you have a cold, you may be able to stick to your usual routine and just get some extra sleep.
If you have the flu, you may need to spend a few days in bed.
Return to your usual activities slowly to avoid prolonging the fatigue.