Sinus infections, or sinusitis, are a common condition that can cause congestion, facial pressure, and headaches. While many sinus infections clear up on their own, some may require antibiotics. The challenge is knowing whether your infection is viral or bacterial, as antibiotics are only effective against bacterial infections. Understanding the signs of a bacterial sinus infection can help you determine when medical treatment is necessary. For same-day sinus infection treatment, visit the walk-in clinic at ...