Chest pain from heavy work may be caused by trauma, myocardial infarction, coronary heart disease and other factors. 1. Trauma: If the chest has previously suffered a violent impact, it may lead to chest contusion, or fracture, resulting in localized pain and swelling. 2. Myocardial infarction: If there is an occlusion of the main blood vessels supplying blood flow to the heart, it may lead to interruption of blood flow, resulting in ischemic necrosis of the myocardium, and the patient may suffer from chest pain that lasts for a longer period of time. 3. Coronary heart disease: If coronary artery atherosclerosis occurs, it may lead to coronary artery stenosis or occlusion, thus causing myocardial ischemia, myocardial ischemia is aggravated by heavy work, and chest pain, chest tightness, palpitations and other symptoms. If you often have chest pain when doing heavy work, you should consult a doctor in time to avoid delaying your condition.