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Head Injury 
Refers to an injury of the head and/or brain, including lacerations and contusions of the head, scalp and/or forehead. See Brain Injury. 

Hematoma 
The collection of blood in tissues or a space following rupture of a blood vessel. Regarding Brain: 
Epidural--Outside the brain and its fibrous covering, the dura, but under the skull. 
Subdural--Between the brain and its fibrous covering (dura). 
Intracerebral--In the brain tissue. 
Subarachnoid--Around the surfaces of the brain, between the dura and arachnoid membranes. 

Hemianopsia Hemianopia 
Visual field cut. Blindness for one half of the field of vision. This is not the right or left eye, but the right or left half of vision in each eye. 

Hemiparesis 
Weakness of one side of the body. 

Hydrocephalus 
Enlargement of fluid-filled cavities in the brain, not due to brain atrophy. 

Hypoxia 
Insufficient oxygen reaching the tissues of the body.