Rib fractures are indeed quite painful because there are abundant intercostal nerves around the rib cage. Once a fracture occurs, if it is not effectively immobilized and treated promptly, the pain is very noticeable. If treated effectively, such as applying external fixation with a rib belt or chest band, and addressing any pneumothorax or hemothorax with targeted treatments, along with using medications that activate blood circulation, reduce swelling, and relieve pain, proactive treatment can usually significantly alleviate the pain of rib fractures within about a week. Typically, by around two weeks, the pain can essentially disappear. However, if not treated actively, the duration of pain may significantly increase.