You will not be able to tell if your sinus infection is bacterial. Rather, your doctor looks at the duration of your symptoms to determine the source of your infection. The symptoms of a viral sinus infection usually begin to improve after five to seven days. Bacterial sinus infections usually last seven to ten days and may even worsen over time. Patients in Tecumseh, OK, can receive a diagnosis and treatment for sinus infections at Immediate Care of Oklahoma. We serve patients from Tecumseh OK, Shawnee OK, Brooksville OK, Johnson OK, Bethel Acres OK, and Dale OK.