ScienceInsights

A longer period can stem from hormonal shifts, fibroids, thyroid issues, or other causes. Here's how to tell what's behind it and when to see a doctor.

From isometric exercise to sleep quality, here's what the evidence says about lowering blood pressure naturally and how much each change actually helps.

Gas-X is generally safe for daily use, but there are dosage limits, a key drug interaction, and times when frequent gas may signal something worth addressing.

Tap, bottled, distilled, or boiled — here's how to choose the safest water for mixing baby formula based on your home situation.

Most colds last 7–10 days, but symptoms shift each day. Learn what to expect, when you're contagious, and what actually speeds up recovery.

Learn how clinicians diagnose PTSD using the DSM-5 criteria, from trauma exposure and flashbacks to mood changes, avoidance, and more.

Gallstones form when bile chemistry gets out of balance. Learn what causes cholesterol and pigment stones, and which factors raise your risk.

Learn what heart rate zones mean for your runs, why easier efforts often work better, and when your numbers might be a sign to slow down or see a doctor.

At 7 weeks, extra sleep is usually normal—growth spurts and brain leaps are often the cause. Here's how to tell when it's fine and when to call your doctor.

Most hair growth supplements are overhyped. Here's what the evidence actually says about iron, vitamin D, biotin, and more.