Respuesta :

Unknowable
The difference between being sick and feeling exhausted is that when you're sick, there's a virus involved which causes a disease and makes you ill.

Feeling exhausted on the other hand is slightly different. You feel physically or mentally drained due to overworking, stress and exercising. 
ncdj04

When you're sick, you're ill, or not feeling well.

When you're exhausted, you're tired, or worn out.