Pain under the chest may be the discomfort caused by intercostal neuritis, suffering from coronary heart disease, gastritis and other diseases will also appear such adverse symptoms, need to consult a doctor in time for examination. 1. Intercostal neuritis: Intercostal neuritis can cause pain under the chest, the pain will be more obvious when sneezing or deep breathing, and the pain will be more intense when carrying out strenuous activities such as expanding the chest. 2. Coronary heart disease: coronary heart disease can also cause pain under the chest, palpitations, nausea and other adverse symptoms, the onset of the disease may be accompanied by tightness in the chest, shortness of breath, shortness of breath and other discomforts, and some patients will have numbness in the hands and feet, and severe cases can lead to sudden fainting or shock. 3. Gastritis: pain under the chest may also be discomfort caused by gastritis, accompanied by acid reflux, nausea, vomiting, flatulence and other symptoms, accompanied by indigestion. There are many reasons for pain under the chest, and you need to seek immediate medical attention and choose the right treatment according to your doctor’s advice to avoid delaying your condition.