A heavy, dragging feeling that doesn't improve with rest. When to See a Doctor
Additionally, fever and poor appetite often accompany sinus infections. Dehydration thickens the blood and lowers blood volume. When you combine dehydration with the fatigue of illness, it is a perfect recipe for orthostatic hypotension—low blood pressure upon standing—which creates that "graying out" or lightheaded sensation. can a sinus infection make you lightheaded
A heavy, dragging feeling that doesn't improve with rest. When to See a Doctor
Additionally, fever and poor appetite often accompany sinus infections. Dehydration thickens the blood and lowers blood volume. When you combine dehydration with the fatigue of illness, it is a perfect recipe for orthostatic hypotension—low blood pressure upon standing—which creates that "graying out" or lightheaded sensation.