causes of a coma
Problems that can lead to coma include: 1  Trauma: Head injuries can cause the brain to swell and/or bleed. 2  Swelling: Swelling of brain tissue can occur even without distress. 3  Bleeding: Bleeding in the layers of the brain may cause coma due to the compression on the injured side of the brain.
A person in a coma remains unconscious for a period of time during which they cannot be woken up, and do not respond to anything around them. Causes of coma include accidents and head injuries, stroke and extremes of diabetes blood sugar levels.
Hypoglycaemia, or blood sugar that's too low, can also lead to a coma. Oxygen deprivation: Oxygen is essential for brain function. Cardiac arrest causes a sudden cut-off of blood flow and oxygen to the brain. After cardiopulmonary resuscitation ( CPR), survivors of cardiac arrest are often in comas.