Type 2 diabetes can develop for years with no symptoms, and 11 million U.S. adults have it undiagnosed. What the numbers mean and what changes outcomes.

One in four U.S. adults gets seasonal allergies. For a stuffy, runny nose, a steroid nasal spray beats an antihistamine pill. Here's how to treat them right.

About 33 million U.S. adults have osteoarthritis. The two treatments with the strongest evidence are exercise and weight loss — not painkillers or supplements.

High blood pressure rarely causes symptoms, so about 1 in 6 U.S. adults don't know they have it. What your numbers mean and what actually lowers them.

Nausea, light sensitivity, and pain that worsens with movement point to migraine, not a tension headache. How to tell the two apart and what each one needs.

Skip the 20-habit sleep lists. These 8 sleep hygiene habits are backed by clinical guidelines and evidence — plus what to do if habits alone are not enough.

About 3 in 4 U.S. adults get physical symptoms from stress. Doctors on what's normal, what to check, and what actually helps — beyond breathing apps.

The head-to-toe exam doesn't move mortality. Here's what an annual physical should actually cover — the screenings, vaccines, and risk numbers that do.

Prediabetes almost never causes symptoms. Learn who should be tested, what the numbers mean, and the change that cuts your risk 58%.

The risk factors that actually raise blood pressure — weight, sodium, activity, alcohol, sleep, stress, and the medicines you don't associate with it.

Blood pressure myths cost people years of undertreated hypertension. Here are the 5 most common ones — and what your doctor wishes you knew instead.

Almost every headache is not an emergency. Here are the 5 red-flag signs — thunderclap onset, stiff neck with fever, and 3 more — that mean call 911 today.