ScienceInsights

Nail ridges are often linked to nutrient gaps or stress, but some may signal health issues. Learn what causes them and how to treat them.

A pinched nerve in the neck can cause sharp pain, tingling, or weakness in your arm. Learn what symptoms to expect and when to see a doctor.

Alcohol contributes to millions of deaths each year worldwide. Here's what the data shows about who's most at risk and why these numbers are rising.

Black period blood is usually older blood that took longer to leave the body. Learn when it's normal and when it might need a doctor's attention.

At 18 weeks, your baby is about the size of a bell pepper. Learn what they're up to, what you might be feeling, and what to expect at your anatomy scan.

At 3 months, most babies nap 4–5 times a day for 30–45 minutes. Here's what's normal, why short naps happen, and how to spot sleep cues.

Blood sugar spikes can cause fatigue, brain fog, and crashes even without diabetes. Learn what they feel like and when to take them seriously.

The FDA recognizes nine major food allergens with specific labeling rules—but some allergens common elsewhere aren't covered, and "may contain" warnings remain optional.

Two periods in one month can have many causes, from short cycles to fibroids. Learn what's likely normal and when to check in with your doctor.

Large mosquito bites are usually an immune response, but genetics, age, and sensitivity all play a role. Learn what's normal and how to find relief.