How to treat sinus infection. A sinus infection, also known as sinusitis, is a common condition that occurs when the sinuses become inflamed and swollen. This can cause symptoms such as nasal congestion, facial pain, headaches, and a runny nose. Sinus infections can be caused by a variety of factors, including allergies, colds, and bacterial infections. There are several ways to treat a sinus infection and alleviate symptoms. One of the most common treatments is over-the-counter medications, such as decongestants and pain relievers. Decongestants can help nasal care information to reduce nasal congestion and swelling, while pain relievers can help to alleviate facial pain and headaches. It is important to follow the instructions on the medication packaging and not to exceed the recommended dosage. In addition to over-the-counter medications, there are also home remedies that can help to treat sinus infections. One popular home remedy is to use a saline nasal spray or ri