Swelling and hardening of the neck muscles is a clinical condition caused by myositis ossificans disease. Myositis ossificans is a disease of muscle sclerosis, toe and bunion deformities caused by the deposition of progressive bony structures in the muscles and connective tissues. The etiology is unclear. It is partly autosomal dominant. It is common in children or young adults. It presents with a deformed congenital oblique neck, torsion, and swelling and stiffening of the neck muscles, but most are not associated with pain. The whole body muscles can be involved. Strenuous exercise or trauma can cause muscle rupture, hemorrhage and hematoma formation, which in most patients is resorbed, but can be followed by muscle stiffness and ossification, eventually leading to stiffness and disability of the corresponding joint of the affected muscle. Prevention of swelling and stiffening of neck muscles: Swelling and stiffening of neck muscles is a complication of severe trauma. Its occurrence and development can be prevented by efforts. Any patient with joint dislocation and severe trauma should consult an orthopedic surgeon promptly. Do not cause secondary injury by blind pushing and massage. Joint dislocation should be reset in time. If there is a large hematoma, it should be promptly punctured and extracted with pressure bandage. Early braking is recommended for joint trauma, and the joint should be fixed in a functional position with a plaster brace. If there is swelling, it is advisable to combine Chinese and Western medicine to make the swelling subside rapidly. For patients with paraplegia caused by spinal cord injury, if a large hematoma of unknown origin is found in the lower extremity, it should be punctured and extracted in time and bandaged with pressure, which are effective methods to prevent secondary ossifying myositis after severe trauma.