Left chest pain is a term verbalized by the common people, in fact, left chest pain, medically, is called precordial pain. The most common causes may be coronary heart disease, angina pectoris, of course there are some other causes, such as intercostal neuralgia, herpes zoster, and even a severe pneumothorax, some lung diseases can also lead to pain in the left chest. But it can be well identified. If the pain is like an electric shock in the left chest, lasting a few seconds at a time, it should be neuralgia. If the patient’s left chest pain is related to moving the limbs, it may be a local muscle and soft tissue problem; if the patient’s left chest pain is accompanied by a feeling of suffocation in the chest, and the symptoms are related to activity, exertion and anger, the cause may be 70% or 80% coronary heart disease and angina. Therefore, if the pain is related to exertion and emotion, the chance of getting coronary heart disease is high, and this kind of pain belongs to high risk. If the pain is only related to deep breathing, and the pain is very short, just 1 or 2 seconds, then the pain may be lower risk or intermediate risk, and you can come back to the clinic at a later date.