What could happen medically if you had sinusitis for awhile and the doctors have not diagnosed patient with it?

Sinusitis: If sinusitis goes untreated it may eventually resolve on its own or it could become a chronic process that could lead to accumulation of inflammatory debris and inability of the sinus to drain causing pain and headaches. Some patients with chronic sinusitis surprisingly have no symptoms and it shows up on a ct scan done for other reasons.