Which stage of Alzheimer's disease has no impairment and indicates normal functioning?

The first stage of Alzheimer's disease, characterized by no impairment, indicates that individuals are functioning normally without noticeable cognitive decline. During this stage, a person may not exhibit any symptoms associated with memory loss or difficulty in cognitive tasks, making it challenging for even the individual or their family members to recognize any signs of the disease.

As the disease progresses into later stages, individuals may begin to show varying levels of cognitive impairment, memory loss, and other symptoms that affect daily living. The subsequent stages are marked by increased challenges, such as disorientation, difficulty in conversation, and ultimately a loss of the ability to perform basic activities of daily living. Each of these later stages highlights the gradual deterioration of cognitive functions, distinguishing them significantly from the first stage where no impairment is present.