ScienceInsights

Alprazolam typically shows up in urine for 4–7 days, but age, liver health, and dosage can push that window longer.

Your ideal workout heart rate depends on your age, goals, and health. Here's how to find your target zone and train smarter.

Capillaries are the only blood vessels thin enough to swap oxygen and carbon dioxide with your tissues — here's how they pull it off.

Swollen feet are often manageable at home, but sometimes signal something serious. Learn what actually helps and when to see a doctor.

Mixing antihistamines and alcohol can be risky, but the safe wait time depends on which type you're taking and a few personal factors.

Mosquito bites itch due to your immune response, but cold, heat, and a few OTC remedies can bring quick relief. Here's what actually works.

You can get hand, foot, and mouth disease more than once. Here's why reinfection happens and what a second case might look like.

Most canker sores heal in 7–10 days, but size, type, and habits can shift that timeline. Here's what to expect and when to see a doctor.

At 17 weeks, it's normal to wonder if your baby is okay. Here's what development looks like, what to watch for, and when to call your doctor.

Millions of Americans live with drug addiction, yet most never receive treatment. Here's what the data tells us about who's affected and why.