An intracranial hemorrhage is a collection of blood within the skull, most commonly caused by rupture of a blood vessel within the brain or from trauma such as a car accident or fall. The blood collection can be within the brain tissue or underneath the skull putting pressure on the brain.
Symptoms include increasing headaches, vomiting, drowsiness, dizziness, confusion, unequal pupil size, and slurred speech. As more blood fills the brain or the space in between the brain and the skull one might appear lethargic, have seizures, or lose consciousness.
Intracranial Hematoma. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/intracranial-hematoma/symptoms-causes/syc-20356145