Sudeck's atrophy, also called reflex sympathetic dystrophy syndrome and complex regional pain syndrome, is long-term pain, usually after a trivial injury.
Thoracic or upper back pain is common. It is typically caused by poor posture or heavy lifting, which strains muscles, ligaments or the thoracic spine.
Myopathies are disorders which affect the muscles of the skeleton causing weakness and wasting. They may be genetic, inflammatory, metabolic or hormonal.
Achalasia is a gastrointestinal disorder. The oesophagus valve tightens, preventing food from passing to the stomach. Achalasia treatment includes surgery.