Your deltoid muscles make up a main muscle group in your upper body. They’re connected with many other muscles and bones in your upper back, neck, and shoulder region and are extremely mobile. They ...

Can't straighten arms after exercising? Learn about causes like inflammation and muscle damage, and discover treatment and prevention tips for faster recovery.

Mind-body coach and CNN contributor Dana Santas tackles the first in a five-part series on the power of strength training to relieve pain and enhance movement.

If you hear a 'tuk' sound whenever you move your shoulder, or if you continue to experience a stabbing pain when you lift ...

Pain in the left arm without chest pain can result from various issues, including injuries and nerve damage. Symptoms can also include arm throbbing, swelling, or numbness. Depending on the cause, the ...

You have 20 muscles in your forearm, the part of your arm between your elbow and your hand. They help you move your arms, hands, and fingers and perform many of the tasks of daily life. You can strain ...

Libby Richards receives funding from the National Institutes of Health and the American Nurses Foundation. Millions have rolled up their sleeves for the COVID-19 vaccine, but why haven’t they rolled ...

There’s a wide range of side effects you could experience after you get the COVID-19 vaccine—including no reaction at all. But arm soreness is one of the most common, in addition to other symptoms ...

The New York Mets are hopeful Francisco Alvarez, already playing with a broken pinkie on his left hand and a torn UCL in his ...