What causes pain in the diaphragm and how can the pain be relieved?

See below: It is highly unlikely that the pain is in the diaphragm. What makes you think that it is in the diaphragm? It may be more helpful of you describe the location of the pain on the body surface, type and intensity of pain and other related issues. Even then if would probably require a physical examination and may be some tests to provide meaningful advice. Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.