The scalp is rich in blood vessels, the head suffered a collision after the rupture of blood vessels, the formation of hematoma, there will be a large bag, but whether there is something to be judged according to the specific circumstances. If only a mild injury, mainly injury to the scalp, it is not a big problem, if the moderate to severe injury, injury to the skull, brain nerve tissue, the problem is serious. 1, mild injury: after the head touched a large bag, pay attention to observe the body’s state of consciousness, vital signs change, to see if there is bleeding, headache, vomiting, slurred speech and other performance. If the scalp hematoma injury area is small, not accompanied by nausea, vomiting, dizziness and other abnormal symptoms, only local trauma, or mild concussion, general observation is sufficient. Through proper rest and rich diet, it can recover in about 1 week, and the local hematoma will mostly improve and disappear on its own; 2. Moderate to severe injury: If the head touches a large bag, resulting in skull fracture, brain contusion, intracranial hemorrhage, brain hernia and other conditions, it is more serious. The body can appear headache, vomiting, hemiplegia, sensory impairment, and even seizures, impaired consciousness and other symptoms, life-threatening, and need to be dealt with as soon as possible.