ScienceInsights

A late period doesn't always mean pregnancy. Stress, illness, diet, and hormonal conditions like PCOS or thyroid issues can all shift your cycle.

Learn what counts as a high heart rate, what causes it, and which symptoms mean it's time to see a doctor.

Mono can be contagious for weeks, even before symptoms appear. Here's what to expect and when it's safe to be around others again.

Most stomach bugs clear up in 1–3 days, but recovery can feel uneven. Here's what to expect, when to eat again, and signs you should see a doctor.

Resting heart rate shifts throughout life. Learn what's normal for your age, why fitness matters, and when to talk to a doctor.

From quick stretches to long-term fixes, here's what actually helps restless legs—including why some treatments can backfire over time.

Thinking about donating plasma? Learn who qualifies, what to bring, and how to prepare for your first appointment.

Vaginal burning after sex can stem from friction, infections, allergies, or hormonal changes. Learn what's causing it and how to find relief.

Your liver is sensitive to what you eat. Learn which foods support liver health and which ones are worth cutting back on.