Causes of disorders of consciousness

Disorders of consciousness can occur if the parts of the brain responsible for consciousness are injured or damaged. The main causes can generally be divided into: traumatic brain injury non-traumatic brain injury progressive brain damage Common examples of these types of brain damage are outlined below. Traumatic brain injury Traumatic brain injury occurs when an object or outside force causes severe trauma to the brain. This is most often caused by: falls traffic accidents violent assault See Head injury, severe for more information. Non-traumatic brain injury Non-traumatic brain damage is usually caused by a health condition, such as: a condition that deprives the brain of oxygen without a continuous supply of oxygen, brain tissue begins to die a condition that directly attacks brain tissue Specific causes of non-traumatic brain injury include: strokes heart attacks severe brain infectionssuch as meningitis (an infection of the outer layer of the brain) or encephalitis (an infection of the brain itself) drug overdoses poisoning almost drowning or other types of suffocation, such as smoke inhalation a blood vessel bursting, leading to bleeding inside the brain the medical term for this is a ruptured aneurysm Progressive brain damage In some cases brain damage can gradually occur over time. Examples of conditions that cause progressive brain damage include: Alzheimer's disease Parkinson's disease a brain tumour