Orbital myositis, also known as extraocular myositis, is a subtype of localized type of nonspecific orbital inflammatory pseudotumor, with common symptoms such as acute onset of headache, eye pain, ptosis and mild edema of the upper eyelid, mild protrusion of the eye, congestion and edema of the bulbar conjunctiva, and limitation of eye rotation. The lesion mainly involves the extraocular muscles, which may be one or more muscles, and also includes injury to the extraocular muscles and injury to the orbital mass, resulting in limitation of eye rotation. The lesions may also involve the optic nerve and surrounding tissues, partly accompanied by thickening of the optic nerve, optic disc edema, and protrusion of the eyeballs, as well as intraorbital continuity and pinprick pain, accompanied by headache, diplopia, and mild vision loss. Orbital myositis may be an autoimmune disease, but also has some relationship with infectious factors and systemic diseases. Hormonal treatment is more effective, but is prone to recurrence. With these symptoms, it is recommended to go to the hospital for diagnosis and treatment by a doctor.