The first cognitive changes can manifest subtly in daily life. Subjective cognitive decline is the individual's perception of a worsening of cognitive abilities that cannot be explained by transient factors such as stress, lack of sleep, or specific emotional situations - and that is not yet reflected in routine clinical tests. Among the most frequent signs are:

In addition, there are risk factors that can increase the likelihood of developing Alzheimer's disease later in life. These include a family history of Alzheimer's, high blood pressure, diabetes, obesity, sleep disorders, and being over 60 years of age.