Many patients with traumatic injuries often request X-rays at the time of consultation, thinking that taking pictures will definitely help in the diagnosis and treatment of the injury, and they are not sure whether bone fractures or wrong bone sutures occur, especially when some patients have already taken X-rays in general hospitals and have to go to another hospital with good conditions to take pictures again. In fact, this is a widespread misconception, resulting in patients receiving unnecessary radiation injury and financial burden. So is it necessary to take X-rays after trauma? To understand this question, we should first explain the simple principle and role of x-ray film. Different tissues in the human body have different densities and have different absorption rates of radiation. X-rays are an important auxiliary examination that uses the different transmission rates of tissues to form intuitive images for the diagnosis of diseases. However, X-rays also have great limitations, for example, gases, liquids and most soft tissues in the human body cannot or cannot be imaged well. For example, gas, fluid and most soft tissues in the human body cannot be imaged or cannot be imaged well, so these tissues with low density cannot be judged correctly by ordinary X-rays, and they cannot play a supplementary diagnostic role. In addition, radiation is harmful to the human body, and the need for X-ray examination should be judged by an experienced doctor, who will make the decision more carefully. After a patient suffers a traumatic injury, there are certain signs and symptoms in the injured area, such as whether there is local swelling, bruising, skin bruising, and pain from force and weight bearing. During the patient’s visit, the doctor’s careful questioning of the patient’s injury and physical examination are the most important diagnostic bases. Therefore, whether or not to take an X-ray should be decided only after a professional doctor has carefully examined the patient and found or suspected signs of injury such as fracture and dislocation, in order to further clarify or help treatment, so as not to cause unnecessary damage.