Myofascial pain syndrome (MPS) is a fancy way to describe muscle pain.
It refers to pain and inflammation in the body's soft tissues.

Myofascial pain is a chronic condition that affects the fascia(description below). 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 source of the myofascial pain is located. Experts believe that the actual site of the injury or the strain prompts the development of a trigger point that, in turn, transfers your pain to other areas of your body. This 'pain transfer' is known as referred pain.
What Causes Myofascial Pain?
Myofascial pain may develop from a muscle injury or from excessive strain on a particular muscle or muscle group, ligament or tendon. Some other reasons for your pain may not even be near your area of pain. Some of causes are:

What Are Some of the Symptoms of Myofascial Pain?
Myofascial pain symptoms usually involve muscle pain with specific "trigger" or "tender" points. Your pain can be made worse with activity or stress. In addition to the local or regional pain associated with myofascial pain syndrome, some people with the disorder also can suffer from depression, fatigue and behavioral disturbances. Talk with your doctor if you begin to notice these symptoms.
What is fascia?
Fascia is essentially all of the connective tissue in the body. It is a tough covering, much like a sausage casing, that surrounds every muscle. It forms a vast supporting network found throughout the body and is continuous from head to toe. It is marked as the white in the picture shown to the right.
Like a coiled telephone cord, fascia holds imprints of our posture and old injuries. Thus, the fascia dictates our shape and freedom of movement. All the nerves and blood vessels run through the fascia. So, if the connective tissue is tight, the associated tissues will have poor nutrient exchange. This exacerbates any painful situation because toxic metabolic waste products build up which will further aggravate pain receptors. This creates a vicious cycle by creating more muscle tension, leading to further thickening and hardening of the fascia, which will further limit mobility.
Chronic pain due to Myofascial Pain Syndrome can be reduced and controlled by various methods that we use successfully.