Hello....sinusitis   is an inflammation or swelling of the tissue lining the sinuses.Acute sinusitis usually starts with coldlike symptoms such as a runny, stuffy nose and facial pain. It may start suddenly and last 2-4 weeks..If you have a simple sinus infection, your doctor may recommend you use a decongestant and saline nasal washes. You shouldn’t use an over counter decongestant more than 3 days..