Alzheimer’s Disease Learning Path

Signs and symptoms overview

Alzheimer’s disease typically progresses through three stages—early/mild, middle/moderate, and late/severe—showing a progressive pattern of cognitive and functional decline. Early symptoms are often mistaken for normal aging or stress and may include short-term memory loss (difficulty remembering recently learned information and acquiring new knowledge), subtle executive-function problems (attention, planning, flexibility, abstract thinking), and semantic memory impairment. Apathy and depression can appear early, and persistent apathy is common throughout the course. As the disease moves into the middle stage, independence declines: learning and memory worsen, language problems become more evident (shrinking vocabulary, reduced word fluency, incorrect word substitutions), and reading/writing abilities progressively deteriorate. Complex motor coordination declines, increasing fall risk. Behavioral and neuropsychiatric changes become more common, including wandering, irritability, emotional lability, resistance to caregiving, sundowning, delusional misidentifications, and loss of insight (anosognosia). Urinary incontinence may also develop. In the late stage, individuals become completely dependent on caregivers. Speech reduces to simple phrases or single words and may eventually be lost, though emotional understanding may remain. Muscle mass and mobility deteriorate, leading to being bedridden and unable to feed oneself. Death is often due to external complications such as infections (e.g., pressure ulcers) or pneumonia rather than the disease process alone.

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First symptoms and early cognitive changes

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