Recurring infections may signal immune dysfunction. Understanding their cause can improve health and boost your defense ...

Sinus bradycardia, or a slow heart rate, can be a sign of cardiovascular health in healthy young adults and endurance athletes. It can also be a sign of an underlying condition requiring medical ...

Sinusitis happens when your sinuses get inflamed due to an infection—usually bacterial or viral. It comes with congestion, facial pressure, and sometimes even a low-grade fever. It can stick ...