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Coma (cont.)

Coma Causes

Head Trauma

  • Coma may result from significant traumatic injury to the head, such as from a car accident or fall.

Bleeding (Hemorrhage) into the brain or skull

Types of brain/skull hemorrhage include:

  • Intracerebral hemorrhage: bleeding within the brain tissue
  • Epidural hemorrhage: bleeding inside the skull, but outside the dura, (the covering of the brain)
  • Subdural hemorrhage: bleeding inside the skull, and inside the dura, but not in the brain tissue itself
  • Subarachnoid hemorrhage: bleeding in the space immediately adjacent to the brain tissue

Causes of brain/skull hemorrhage include:

Picture of the areas of the brain subject to injury
Picture of the areas of the brain subject to injury

Swelling of the brain (cerebral edema)

Causes of swelling of the brain

  • Infections
  • Chemical imbalances
  • Traumatic injuries
  • Problems with the flow of cerebrospinal fluid (CSF)

Lack of oxygen to the brain

The most common causes for lack of oxygen to the brain include:


  • External poisons are those that are ingested or inhaled
  • Internal poisons are by-products of the body's normal metabolism that for some reason cannot be excreted properly

Endocrine disorders

Medically Reviewed by a Doctor on 10/1/2015
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