ScienceInsights

Most 3-year-olds weigh between 26 and 38 pounds, but what matters more is whether your child is growing steadily over time.

Black stool can come from foods or medications, but it can also signal bleeding. Here's how to tell the difference and when to see a doctor.

Yeast infections are common and treatable. Learn what causes them, what symptoms to expect, and how to tell them apart from other infections.

Red blotches on your skin could be hives, eczema, rosacea, or something else. Learn what common causes look like and when to see a doctor.

20 mg of Vyvanse typically lasts 10–14 hours, but metabolism, food, and body chemistry can shift that window for many people.

Swelling after a tooth extraction usually peaks around day 2-3 and fades within a week. Learn what's normal, what helps, and when to call your dentist.

From antiviral creams to medical-grade honey, here's what actually speeds up cold sore healing and what's mostly hype.

Nipple soreness can begin as early as 1-2 weeks after conception. Learn what's normal, when it fades, and how to find some relief.

Wisdom teeth often cause real problems—from infections to crowding—but removal isn't always required. Here's what actually determines whether yours need to come out.

Trazodone can cause side effects ranging from drowsiness and dizziness to more serious risks like heart changes and serotonin syndrome. Here's what to know.