Pain on the outside of the chest is most commonly associated with thoracic costochondritis, a sterile inflammation of the cartilage between the sternum and the ribs. In this case, there is usually a well-defined localized pressure point, and if the local inflammation is severe, there are also symptoms of redness, swelling, heat, and pain, such as localized elevated skin temperature and flushing of the skin. The pain in this area is present or worsens during thoracic activity such as deep breathing, coughing, or forceful lifting. If the pain is not related to thoracic activity, it is important to consider the presence of heart disease, such as angina or myocardial infarction. In addition to localized pain, this condition may be accompanied by symptoms such as chest tightness, palpitations, dizziness, weakness of the limbs, pallor, and cold sweat, etc. It is important to go to the hospital immediately for an electrocardiogram and a blood test for troponin to confirm the diagnosis.