It is possible to have pain on cloudy days after a comminuted patella fracture, and the possible reasons are the fracture has not yet healed, inflammation, soft tissue injury and so on. 1. The fracture has not healed yet: if the fracture has not healed completely, the blood circulation in the knee joint will be slowed down on cloudy days due to the cold weather, and the fracture site will be stimulated by inflammation, which may cause pain. 2. Aseptic inflammation: after a comminuted patella fracture, even if the fracture has healed, there is a certain possibility of aseptic inflammation in the knee joint. On cloudy days, when the weather is cold, the metabolism of inflammatory metabolites is slower, and inflammatory stimuli can trigger pain. 3. Soft tissue injury: patella comminuted fracture caused by strong violence, can be accompanied by the surrounding blood vessels, ligaments and other soft tissue injuries. Poor blood circulation and tissue ischemia can also cause pain on cloudy days or when the temperature drops. The causes of pain on cloudy days after a comminuted patella fracture are many, and may also be related to scar formation and other factors, if the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, improve the examination to clarify the cause of the disease, and follow the doctor’s instructions for targeted treatment.