Dietary precautions for polymyositis include avoiding spicy and stimulating, dry, hard and rough, and cold and greasy foods. Polymyositis is an inflammatory lesion of skeletal muscle, which may be caused by factors such as heredity, viral infection and abnormal autoimmune function. Patients mainly show weakness of the proximal limbs, dyspnea, arrhythmia and other discomforts, and should avoid eating dry, hard and rough food, such as dried buns and cookies, so as not to aggravate swallowing difficulties and complications. Foods such as spicy stimulation and cold and greasy foods may aggravate the patient’s gastrointestinal reaction, so they are not recommended. Patients can eat light and easy to digest food rich in protein and vitamins, and develop good eating habits, which is conducive to the recovery of the patient’s condition. When the patient has symptoms of polymyositis, it is recommended that the patient go to the rheumatology and immunology department of the regular hospital in time for examination and treatment according to the specific cause of the disease.