3 Home Remedies for Sinusitis You may have wondered what is Sinusitis? It is a Sinusitis is a common condition in which the lining of the sinuses becomes inflamed. It’s usually caused by a viral infection and often improves within two or three weeks. The sinuses are small, air-filled cavities behind your cheekbones and forehead. An excellent home remedy for sinusitis is to do the cleansing of the nose and sinuses with a mixture of…"3 Home Remedies for Sinusitis"