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Fritz Kruger wondered how breathing pure oxygen while enclosed in a pressurized tube could heal his body from side effects of radiation treatments.

Living with a chronic condition can be a challenge. Just ask Barb Welch. She lives with two of them. “I have diabetes and arthritis,” Welch says. “I have a lot of aches and pain...

There are many research studies about COVID-19 vaccinations. How can you decide which studies are accurate, informative and worthwhile? Here are some tips to weed through it all.

Need to show proof of your COVID-19 vaccination and tests? Learn how to use your Patient Online Services account or the Mayo Clinic app to access proof.

Did you know calcium is the most abundant mineral in your body? It makes up about 2% of your weight and is necessary for strong bones. Find out if your daily calcium intake hits the recommended level.

A Mayo Clinic expert shares what you need to know about expiration dates for at-home COVID-19 tests. Find out if these tests can detect new COVID-19 variants and what to do if the test is positive.

Pinpointing the most fertile days of your cycle can increase the chances of conception. Learn the signs of ovulation and ways to track it using your body's clues and other tools.

Physical activity is good for people of all ages, especially seniors. Here are tips to keeping moving even during winter's cold, dark days.

A trusting relationship does more than just feel good. Learn how trusting the expert advice of your primary care provider can improve your health.

While you're enjoying the outdoors, ticks are looking for a ride — and a meal. Ticks survive on blood from humans and animals, and can transmit disease. Learn how to tame these unwelcome hitchhi...