Sudden cramp-like pain in the chest may be related to the chest muscle strain, coronary heart disease, respiratory disease and other reasons. 1. Chest muscle strain: most of the chest soft tissue strains caused by improper exercise will lead to chest pain, you can relieve the symptoms through appropriate massage, physical therapy, pay attention to warm up before exercise to prevent. 2. Coronary heart disease: coronary heart disease caused by the blood supply of oxygen and thus cause myocardial ischemia, the typical symptoms of chest tightness, chest cramps like pain, often accompanied by chest tightness, shortness of breath, you should immediately stop the activity of exertion, timely rest, calming emotions. 3. Respiratory diseases: including pneumothorax, acute and chronic pleurisy and other respiratory diseases may also cause sudden cramp-like pain in the chest, dyspnea and other symptoms. If you have a sudden cramp-like pain in the chest, you should go to the hospital in time to find out the cause and then be treated under the guidance of your doctor.