Determining muscle strains and tears is usually done from symptoms, history, signs, and examination. 1. history: trauma usually causes muscle strains muscle strains are caused by sharp contractions during exercise and pain at the site of the strain. The inability of the muscle to exert force usually causes the muscle to tear. Muscle tears are the result of exceeding the strength of the muscle fibers when performing high-intensity exercise, and muscle tears can limit movement. 2. Symptoms: Muscle strains are usually painful at the site of the strain, the muscle will form a strip of hard lumps, localized skin swelling. Muscle tear is generally muscle fiber breakage, pain when pulling, localized soreness and so on. 3. Signs: muscle strains are generally sports when the preparation is not done, the muscle does not reach the state of the movement or the wrong action, etc. can cause muscle strains. Muscle tear is a pain that increases when the injured muscle is actively contracted or passively stretched. A positive muscle contraction resistance test means increased pain or a ruptured indentation. 4. Examination: Muscle strains caused by trauma are usually examined by ultrasound and physical examination. And muscle tear due to inability of muscle to exert force usually do electromyography and MRI examination, etc.. It is recommended that patients go to the hospital for examination and then under the guidance of the doctor for targeted treatment.