Causes and Risks

• normal aging
• Alzheimer's disease
• depression
• head trauma
• hysteria
• seizures
• chronic alcohol abuse
• drugs such as anesthetics, barbiturates, and hallucinogens
• electroconvulsive therapy (ECT)
• temporal lobe surgery for conditions such as a brain tumor
• stroke
• Huntington's, Parkinson's, Creutzfeld-Jakob, Pick's, and Wilson's disease
• atherosclerosis, or hardening of the arteries
• multiple sclerosis
• AIDS
• viral or bacterial encephalitis
• normal pressure hydrocephalus
• chronic subdural hematoma , or bleeding on the brain
• brain tumour

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