Right chest pain after 18 days of right rib fracture may be due to unhealed fracture, intercostal neuritis or pleurisy. 1. Unhealed fracture: right rib fracture usually produces pain symptoms, this pain will gradually disappear with the recovery of the fracture site, if the patient’s physical condition is poor, the recovery time is relatively long, the rib fracture can still have pain at 18 days. 2. Intercostal neuritis: Intercostal neuritis can be induced by pathologic fracture or trauma, which will cause chest pain, presenting as burning pain or stabbing pain, and the pain will be aggravated when coughing, sneezing or deep breathing. 3. Pleurisy: rib fracture may induce pleurisy, which will lead to chest pain, chest tightness, and if the situation is serious, it may cause respiratory difficulties. Right rib fracture 18 days after the right chest pain persists unrelieved, should be timely to the hospital for examination.