Its symptoms can impact every part of a person's life. Alzheimer's disease leads to changes in behavior, personality, and abilities.

症状明显影响生活的各个方面，导致行为改变、人格异常和生活能力下降。

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That means, just like a man with prostate cancer may not have any symptoms, a person's brain may have undergone changes that lead to Alzheimer's without visibly affecting a person's day-to-day life.

CNN: Less-stressed people may have lower dementia risk