Pain in the left side of the chest when angry can be caused by changes in hormone levels in the body following mood swings, which can lead to mastocytosis. Many patients have nodules or lumps in their breasts. Mood swings can affect changes in hormone levels in the body, and because mastocytosis is associated with endocrine disorders, patients may experience chest pain, panic attacks, and shortness of breath, which can usually improve after rest. In addition, some patients may have myocardial ischemia, or acute coronary syndrome or coronary spasm, which affects the blood supply to the heart muscle, so they may have left-sided anterior chest pain, accompanied by rapid heart rate and changes in blood pressure, which can be initially diagnosed by electrocardiography. You should pay attention to keep your mood stable, optimistic and relaxed, and also pay attention to low salt and low fat diet.