Dementia is the loss of mental abilities caused by brain disorders that affect memory, thinking, behavior and judgment. The most common cause of dementia, especially in older people, is Alzheimer's disease. It causes up to seventy percent of dementia cases.痴呆症是由大脑功能紊乱引起的心智能力丧失,这种大脑功能紊乱会影响到记忆、思维、行为和判断。痴呆症,尤其是老年痴呆症,最常见的原因是阿尔茨海默氏症。70%以上的老年痴呆症病例是由阿尔茨海默氏症引起的。
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Worldwide and estimated thirty aix million people are living with dementia, a new report predicts that number will increase to more than one hundred fifteen million by 2050