What should i do if i get a pain on my chest?

See a doctor: Would like to have more details about your chest pain and medical history. Chest pain can be serious and can be a sign of heart, lung , gastrointestinal , and musculoskeletal diseases just to name few. If the pain comes with physical activity and relieved with rest, a heart disease is likely. If it is related to food intake then it could be gastrointestinal in origin. See a doctor for evaluation.