A pulled muscle is an injury to your muscle fibers. Muscle fibers are the large cells that make up your muscles. Your muscles allow you to move when they contract and relax. Many people use the terms ...

While it's rare and preventable, if a vaccine is incorrectly injected into your shoulder, it could cause shoulder injury related to vaccine administration, or SIRVA. The inflammation from SIRVA could ...

This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. A muscle strain, or a pulled muscle, is among the most common injuries affecting people of all ages, particularly those engaging in ...