阿兹海默症是一种神经退行性疾病，影响记忆、认知和行为。根据阿尔茨海默症与ementia国际组织（Alzheimer's Association）的标准，阿兹海默症可以分为七个阶段：
**阶段1：预警期（Preclinical stage）**
* 无明显症状，但有增加的风险因素，如高血压、糖尿病等。
* 人员可能在家族中有较高的患病风险。
**阶段2：早期期（Early-stage) （ Mild Cognitive Impairment (MCI))**
* memory loss，尤其是短期记忆损失
* 问题性的认知功能
* 没有影响日常生活
**阶段3：轻度阿兹海默症（Early Alzheimer's disease)**
* Memory loss worsens, and daily life is affected
* Trouble with communication, problem-solving, and judgment
* Mood changes, such as anxiety or depression
* Easily getting lost in familiar places
**阶段4：中度阿兹海默症（Moderate Alzheimer's disease)**
* Significant memory loss, confusion, and difficulty with daily tasks
* Trouble with speech, writing, and comprehension
* Loss of initiative and independence
* Mood changes can be intense
**阶段5：重度阿兹海默症（Late-stage Alzheimer's disease)**
* Severe memory loss, disorientation, and difficulty speaking
* Need for full-time care
* Difficulty swallowing or feeding
* Can become violent or aggressive
**阶段6：终末期阿兹海默症（End-stage Alzheimer's disease)**
* Complete loss of cognitive function, speech, and mobility
* Require complete care and supervision
* May experience pneumonia, sepsis, or other life-threatening complications
**阶段7：死亡**
* 死亡是阿兹海默症最终阶段的结果
请注意，每个人都有不同的发展速度和表现，且阶段之间可能会有重叠或不明确的界限。
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