Ever get a sinus infection following a bad cold? It’s called sinusitis. After a cold, you are at greater risk of developing a sinus infection, because a cold can cause an inflammation and swelling of the sinuses. While common cold symptoms can make you miserable, they are common problems and affect millions of Americans each day. Sinusitis though a common condition, should be treated more seriously. Here is some information that will help you make a distinction between the two.