The Spanish flu killed an estimated 50–100 million people, but why such a wide range? Learn what made this pandemic uniquely deadly and hard to measure.
Stomach viruses spread through more routes than most people realize, and you can be contagious longer than you think. Here's how transmission actually works.
Stage 3 liver disease involves significant scarring but often no symptoms. Learn what causes it, how it's diagnosed, and whether fibrosis can be reversed.
Vaginal itching has many possible causes, from contact irritants to infections and hormonal shifts. Learn what might be behind your symptoms and how to find relief.