A blood clot in the head is a cerebral hemorrhage, and cerebral hemorrhage is a critical condition in neurology: i. caused by hypertensive disorders; ii. caused by craniocerebral trauma of various causes. A blood clot in the brain is a cerebral parenchymal hemorrhage, which can cause headache, vomiting, slurred speech, and limb paralysis; severe patients will be in a coma, and even stress ulcers, ionic disorders, and concurrent infections, which can even be life-threatening. Some patients with massive cerebral hemorrhage need urgent surgical treatment, while patients with a small amount of cerebral hemorrhage can be treated conservatively to promote the absorption of blood clots.