Polymyositis is inflammation of several voluntary muscles.
Costochondritis is inflammation of the muscles in the ribs
Capsulitis
Myositis is a general term for inflammation of the muscles. There can be several causes. The most common being polymyositis and dermatomyositis.
intercostal muscles - from inter meaning 'between', and costa meaning 'rib'
Diastasis
The inflammation of the heart muscles. (Cardio = heart; myo = muscles; -itis = inflammation)
rigormortis
Tetany is the medical term meaning inability to relax the muscles.
Colic is the medical term meaning spasm of the visceral muscles.
Contracture or contraction
The medical term for muscles located within an organ is "smooth muscles" or "involuntary muscles." These muscles are responsible for the involuntary movements of internal organs, such as those in the digestive system, blood vessels, and uterus.
Myologist is the term meaning specialist in the study of muscles, but an orthopedist is the typical specialist physician who treats muscle problems.