A few sudden pains in the left side of the chest should be considered for several reasons: coronary sclerotic heart disease, pneumonia, intercostal neuralgia, and other factors. To be treated according to the specific circumstances. 1. Coronary atherosclerotic heart disease: coronary heart disease patients with hypertension or diabetes, high blood fat and other risk factors will lead to heart blood vessels are prone to stenosis or occlusion, which in turn leads to cardiac hypoxia and ischemia, resulting in sudden pain in the heart. To consult a doctor in time, check the electrocardiogram and heart ultrasound, and take aspirin and other anti-platelet therapy. 2. Pneumonia: If lung inflammation will involve the pleura, it will cause extrusion or pulling on the pleura, thus causing neuralgia on the pleura, especially when coughing will cause chest pain. Penicillin and other antibiotics should be preferred for treatment. 3. Intercostal neuralgia: patients with intercostal neuritis have inflammatory reaction due to the stimulation or compression of intercostal nerves, thus causing chest wall pain. Transient chest pain may first appear at the initial onset. Treatment should be non-steroidal anti-inflammatory drugs such as ibuprofen pain management. If any of these factors are present, it is important to seek medical attention to avoid delays that could be life-threatening.