Inflammation of the tendon sheath, associated with the flexors of the hand and fingers. Swelling puts pressure on the median nerve and creates pain.
Muscle tear. (sprain is torn or stretched ligament)
Progressive muscle weakness. Could lead to respiratory paralysis.
Muscular weakness due to a malfunction of the immune system. The immune system seems to attack the neuromuscular junctions. The first symptom is usually ptosis (drooping eyelids). Weakness in the jaw muscle will continue to the point where the patient cannot move their jaw.
Inflammation of the muscles and joints. Pain but no muscle weakness. Stems from unknown causes...possibly a virus.