Sinus infections cause blockage in the sinus and though you can use antibiotics as an answer to how to stop sinus infections, it will at best only remove the infection and not the root causes. If you want to strike at the very root causes, you will need to flush out the blockages, and the easiest thing for you with regard to how to stop sinus infections is to make your own Ph neutral sinus flush and the salt contained in the solution will actually help to kill off germs, and to make the Ph neutral sinus flush .