Myofascial pain (muscular pain) refers to pain and inflammation in the body's soft tissues.Myofascial pain is a condition that affects the fascia (connective tissue that covers the muscles). Myofascial pain syndrome may involve either a single muscle or a muscle group. In some cases, the area where a person experiences the pain may not be where the myofascial pain 'generator' is located. Experts believe that the actual site of the injury or the strain prompts the development of a trigger point that, in turn, causes pain in other areas. This situation is known as referred pain.Myofascial pain may develop from a muscle injury or from excessive strain on a particular muscle or muscle group, ligament or tendon.Other causes include:•Injury to intervertebral disc.•General fatigue.•Repetitive motions.•Medical conditions (including heart attack, stomach irritation).•Lack of activity (such as a broken arm in a sling).Myofascial pain symptoms usually involve muscle pain with specific "trigger" or "tender" points. The pain can be made worse with activity or stress. In addition to the local or regional pain associated with myofascial pain syndrome, people with the disorder also can suffer from depression, fatigue and behavioral disturbances.Muscles are sprained when they are placed under an excessive physical load. The sprain does not normally affect the whole muscle, but is usually confined to one or two small muscles fibres within the main body of the muscle. The sprain causes a rupture of a few muscle cells, producing initial pain and inflammation, and which usually settles within 1 -2 weeks. During this healing period it is possible to feel a painful taut band within the affected muscle where it has been sprained. This taut band is often referred to as an active trigger point (TrP).