Chronic sinusitis on its own isn’t a life-threatening condition; however, if left untreated, the condition can become severe.
If a patient doesn’t get the necessary treatment to eliminate chronic sinusitis, the infection can spread to other parts of the body, such as the bones, marrow, spinal fluid, and brain. If this occurs, the condition can evolve into more severe complications, such as meningitis and brain abscesses, both highly dangerous situations that require emergency surgery to save the patient’s life.