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.

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 ...

Chest discomfort, unexplained arm or jaw pain, sudden upper back strain, or even stomach aches can sometimes be early warning ...

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 ...

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 ...

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 ...