Symptoms of muscle injury mainly manifest as pain, swelling, activity limitation and other related manifestations (muscle hardening, etc.), which need to be combined with relevant examinations to clarify the condition and treatment. 1. Pain: according to the severity of muscle injury, it is mostly seen in contusion, strains and lacerations, etc., and there is obvious pain in the injured area, which can be manifested as soreness in mild cases, and severe pain in serious cases, which is aggravated by activities. 2. Swelling: after muscle injury, the muscle tissue is damaged and oozing can cause swelling, if the blood vessels are damaged, it can lead to bleeding, and blood accumulation in the soft tissues can also lead to local swelling. 3. Restriction of activities: Most of the patients are afraid to move because of the aggravation of pain during activities, especially when the muscle injury is serious and the nerve is severed, the activity function of its innervated part is lost. 4. Other: some patients may show muscle spasm and hardening after muscle injury, and when the muscle is seriously torn or broken, the injury site can be touched with depression. It is recommended to go to the hospital in time when the above symptoms appear, complete the auxiliary examination, clarify the condition, and be treated by the professional doctor, so as not to be negligent, so as not to delay the condition.