Will a sinus infection cause anosmia?

It can. The olfactory (smell) nerve fibers are located in the upper nose in a small area. Swelling from infection can block the smell molecules from getting uo to the olfactory nerve fibers. This is usually temporary. Also, certain viruses can directly damage the olfactory nerve fibers sometimes causing permanent anosmia.

Related Questions

Will a sinus infection cause light headed and fatigue or could it be an std?

Both, either or none. Sinus infection is very tricky. It may mimic many conditions including but not limiting to those you mentioned. Advanced std may do the same if left untreated. Number of medical and mental conditions may do the same. See your primary doctor first to sort it out. Do not expect to get all answers at once. Extensive work up is required sometime to get the right answers. Read more...