Trapezius muscle is situated between posterior neck and the shoulder joint. When there is a pain on this area, people says that "I have a pain on my shoulder." This is wrong. It's not shoulder joint. Pain on this area is called myofascial pain syndrome.
The temporomandibular joint(TMJ) connect your lower jaw to your skull. Main causes are the effects of physical and emotional stress on the structures around the joint. Stress can make your jaw muscles to contract slightly always and sometimes make you grind your teeth while you sleep. Symptoms are click sounds in the jaw, inability to fully open the mouth, jaw pain, TMJ pain, chewing difficulty, headaches, earaches, etc.
Chronic muscular pain on the trapezius muscle or TMJ is very hard to treat. If you are suffering from pain on the trapezius muscle area and/or on the scapular area or on the TMJ, whether it is acute or chronic(even over 10 years), Morix would be a great and immediate help for you. (usually after 10 minutes) In little cases of TMJ pain, Releagen could be a second choice.

note :
The information provided is of a general nature and should not be used as a substitute for professional medical advice. To diagnose clearly you should discuss with your family doctor.