Sinusitis, or a sinus infection, becomes more common during this time of year. Even though most of us have either dealt with or heard of sinusitis before, do you know what causes it? Our AFC Urgent Care Athens, TN team provides some helpful answers and further information about this below, so keep reading. What Is Sinusitis? Sinusitis is an inflammation or swelling of the tissue that surrounds the sinuses, which are hollow spaces within the ...