Fluid buildup in a rib fracture is often caused by a rib fracture that punctures the lung and causes bleeding, which can manifest itself as fluid in the chest cavity, and early CT and X-ray examinations should be performed to see the amount of fluid buildup. If the fluid accumulation is particularly large and affects breathing, early drainage of the closed chest drainage tube should be performed so that the fluid can flow out and relieve the symptoms of breathing difficulty caused by pressure on the lungs. If the amount of fluid is not large and the symptoms of dyspnea do not appear, observation can be performed and CT or X-ray will be repeated once in 2-3 days. If the fluid accumulation continues to increase, consider closed chest drainage surgery. If the fluid does not increase or gradually decreases, observation can continue without surgical treatment. Therefore, it is important to review rib fractures with fluid accumulation to avoid severe respiratory distress and even life-threatening problems due to excessive fluid accumulation.