A person with brain disease has a problem with the function and-or structure of the brain. Brain disease can occur in all age groups, but becomes more common in old age.

Brain disease may be the result of:

• Genetic disease:
• Schizophrenia
• Huntington's disease
• Neurodegenerative disorders:
• Multiple sclerosis
• Alzheimer's disease
• Senile dementia
• Infections:
• Encephalitis
• Herpes encephalitis
• Atherosclerosis:
• Stroke
• Intracerebral hemorrhage
• Cancer:
• Brain tumor
• Brain cancer
• Neurotransmitter imbalance:
• Depression
• Bipolar disorder
• Head injury:
• Concussion
• Brain contusion
• Subdural hematoma
• Alcohol abuse:
• Wernicke-Korsakoff syndrome
• Epilepsy