Vague pain under the right chest, resulting from: 1. Mainly the right chest is in the place of the lung, consider that it is caused by the lung, the presence of pneumonia, bronchitis, lung abscess, tuberculosis, lung tumor, will appear vague pain in the right chest. 2. It is possible that pleurisy causes pain. 3. It is possible that intercostal neuralgia, trauma to the ribs or fracture, resulting in pain in the right chest. 4. Consider that there is a heart problems, such as pericardial effusion, right ventricular hypertrophy, and systolic insufficiency that lead to pain. Therefore, to understand the cause of the pain, it is advisable to go to the hospital for a thorough examination, otherwise the condition will be delayed.