Muscle pain is usually caused by some sort of injury, strain, pull or repetitive stress to a part of the body controlled by your muscles. Along with tendons and ligaments, muscle pain is among the most common type of soft tissue pain most people experience. Your muscles are formed into functional groups that are used to stabilize your body and help you move, like walking and climbing. When a muscle is damaged or strained other muscles around it try to compensate for the injury by taking on more work and often leading to more muscle pain. Muscle pain can be tricky and often feel as though it is somewhere other than the actual injury, what is called referred pain.