If you have a nasal congestion that continues after a cold or a bout of allergies and you start noticing facial pain or pressure in your sinuses, there is a good chance you have a sinus infection. Sinus infections, or sinusitis, can leave you feeling congested, achy, and fatigued. While some infections develop gradually over time, others can seemingly appear out of nowhere. If you’ve ever wondered whether sinus infection symptoms can appear suddenly ...