If there are internal injuries after being hit by a car, the manifestation usually occurs in a few minutes to a few minutes, and some patients may have a delayed appearance of symptoms for about 3-7 days. If there is internal injury after being hit by a car, i.e., rupture and bleeding of internal organs, such as brain hemorrhage, liver rupture, spleen rupture, kidney rupture, intestinal rupture and pneumothorax, the patient will usually show the corresponding internal organ injury in a few minutes to a few minutes, but some patients will show delayed internal organ injury, which requires repeated evaluation. Most delayed visceral injuries will manifest themselves within 3-7 days, and only rarely will they manifest themselves more delayed. Patients should be carefully observed after returning home to see if any new symptoms appear, such as dizziness, headache, nausea, abnormal speech, or the appearance of weakness or abdominal pain, and seek prompt medical attention for these conditions. After a car accident, joint imaging examinations, such as ultrasound, CT, MRI, and angiography, should be performed early. Generally, the rate of missed diagnosis will be significantly reduced by combining two or more examination methods.