Temporomandibular joint disorders, or TMJ, are a group of problems that cause pain and poor function in the jaw and surrounding muscles.
Tendonitis is inflammation in a tendon, which is the tissue that connects muscle to the bone. This condition causes pain or feelings of tenderness primarily around joints such as the knee, foot, elbow and shoulder.
Recent studies indicate that chronic pain associated with a physical injury may be influenced by stress and emotional issues. In addition, several studies have found that 15-30% of patients with chronic pain also suffer from post-traumatic stress disorder (PTSD).