痴呆症是嚴重的記憶力，語言，問題解決能力和其他思維能力的喪失，會干擾日常生活。 阿爾茨海默氏病是痴呆症的最常見原因。
Dementia is a severe loss of memory, language, problem-solving skills and other thinking abilities that can interfere with daily life. Alzheimer's disease is the most common cause of dementia.