Sternocleidomastoid muscle injury can be relieved with rest and physical therapy if it is mild, if it causes swelling in the neck, it means that the degree of injury is more serious, it is recommended to consult a doctor in time, identify the cause of the injury and follow the doctor’s instructions for immobilization, braking and medication, and in serious cases, surgical treatment may be required. 1. Rest: Sternocleidomastoid muscle injury is often caused by falling pillow or improper exercise, etc. Sufficient rest should be given to reduce neck movement and choose the right pillow to promote muscle recovery. 2. Physiotherapy: ice packs should be applied in the early 72 hours of injury to reduce local swelling, and after 72 hours, hot packs, infrared rays and other physiotherapy methods can be used to promote local blood circulation and inflammation absorption. 3. Fixation and braking: If the injury is serious, the neck should be fixed and braked properly under the guidance of doctors, such as wearing a neck brace or using two sandbags on both sides of the neck. 4. Medication: If the injury causes pain, you can choose non-steroidal drugs such as ibuprofen, diclofenac sodium and other oral medicines, or diclofenac diethylamine salt emulsion, blood circulation and pain relief cream and other topical medicines to be applied to relieve the pain. 5. Surgery: If the sternocleidomastoid muscle is severely torn or ruptured, surgery may be needed to repair and close the muscle. It is recommended that patients with neck swelling caused by sternocleidomastoid muscle injury should consult a doctor in time to clarify the severity of the condition and carry out standardized treatment under the doctor’s guidance to avoid delaying the condition.