The most common causes of right flaccid rib pain are costochondritis or intercostal neuralgia, both of which need to be diagnosed by first ruling out other organic diseases that can cause pain in the area, such as lung disease, pleural disease, rib fracture, heart disease, and peri-diaphragmatic disease. ECG, chest CT, and upper abdominal CT should be completed first. If all are normal, only then can the diagnosis be made. Intercostal chondromalacia pain is mostly persistent dull pain with pressure when local pressure is applied, while intercostal neuralgia is episodic throbbing or stabbing pain with no pain when local pressure is applied, which can help differentiate.