Alzheimer’s disease and other common forms of dementia including vascular dementia, dementia with Lewy bodies, and frontotemporal dementia are progressive conditions, with symptoms worsening over time as the disease progresses. Learn more about the stages of dementia and what to expect from your loved one as dementia progresses.
Although the two terms are often used interchangeably, Alzheimer’s disease and dementia are two different terms. Dementia is an umbrella term used to describe several conditions and it includes Alzheimer’s, as well as other conditions with shared symptoms. More than mere forgetfulness, an individual must have trouble with at least two of the following cognitive areas to be diagnosed with dementia:
- Communication and speech
- Focus and concentration
- Reasoning and judgment
- Visual perception (including trouble detecting movement, differentiating colors, or experiencing hallucinations)
The assessment tools used to determine which stage of dementia a person is experiencing are meant to be a guide and a rough outline of what caregivers can expect and when they can expect it. Some symptoms may occur later than others, others may appear in a different order than the scale predicts, and some may not appear at all. Some symptoms may appear and then vanish, while others will continue to worsen over time. Because every person is different and dementia manifests itself uniquely, the speed at which dementia progresses varies widely. On average, a person with Alzheimer’s disease lives 4 to 8 years after a diagnosis, but some have been seen to live as long as 20 years.
Using the GDS to Measure Dementia Progression
As the disease progresses, different signs and symptoms will become increasingly obvious. While there are several scales to measure the progression of dementia, the most common scale is the Global Deterioration Scale for Assessment of Primary Degenerative Dementia (GDS). The scale is also known as the Reisberg Scale. According to the GDS, there are seven different stages of Alzheimer’s disease correlating with four distinct categories: no Alzheimer’s, mild Alzheimer’s (or early-stage), moderate Alzheimer’s (or middle-stage), and severe Alzheimer’s (late-stage).
Signs and Symptoms of Dementia According to Stage
This category includes stage 1, stage 2, and stage 3. In Stage 1 of dementia, there are no signs of dementia, the person functions normally, and is mentally healthy. People with no dementia diagnosis are considered stage 1. From there, the disease progresses into stage 2, very mild cognitive decline. In this stage, there is normal forgetfulness that often attributed normal signs of aging. In stage 2, symptoms of dementia are still not apparent to medical professionals or loved ones. The last stage in this category is stage 3, mild cognitive decline. At this stage, loved ones may begin to notice signs of cognitive decline as their loved one experiences increased forgetfulness, decreased performance at work, speech difficulty, and difficulty focusing on everyday tasks. This stage usually lasts 7 years before the onset of dementia.
Early-stage dementia has only one stage – stage 4, moderate cognitive decline. This stage lasts an average of 2 years and cognitive issues can be detected during a medical interview and exam. People in this stage will have difficulty concentrating, will forget recent events, and will have difficulty managing finances and traveling alone to new locations. Additionally, they may experience difficulty socializing and begin withdrawing from friends and family.
Symptoms of early-stage dementia
- Misplacing items
- Forgetting recent conversations or events
- Struggling to find the right words in a conversation
- Losing track of the day, date, or time
- Loss of interest in other people or activities
- Unwilling to try new things
- Increased feelings of anxiety, irritability, or depression
- Trouble remembering names when meeting new people
- Increased trouble planning or organizing
Mid-stage dementia is comprised of two stages. Stage 5, moderately severe cognitive decline and stage 6, severe cognitive decline, or middle dementia. Lasting an average of 4 years, a person in mid-stage dementia now needs assistance to complete activities of daily living. In stage 6 of dementia, a person may start forgetting the names of close loved ones and have little memory of recent events. Communication is severely disabled and delusions, compulsions, anxiety, and agitation may occur.
Symptoms of mid-stage dementia
- Problems sleeping and confusing day and night
- Behaving inappropriately in social settings
- Wandering or becoming lost
- Difficulty with perception
- Delusions and/or hallucinations
- Increased aggression and irritability
- Inability to recall personal history, address, and phone number
- Changes in sleep patterns may begin
This final category of dementia includes one stage. Stage 7, very severe cognitive decline lasts an average of 2.5 years. A person in this stage usually has no ability to speak or communicate and requires assistance with most activities, including walking.
Symptoms of late-stage dementia
- Difficulty eating and swallowing
- Considerable changes in weight (both loss and gain)
- Gradual loss of speech
- Angry outbursts due to confusion
- Increasingly vulnerable to infections, especially pneumonia
While the exact symptoms displayed in each stage can differ from person to person, this assessment can be used as an outline, helping families know what to expect and when to expect it. Have you seen the progression of dementia in your loved one follow a similar path? Share your experiences with us in the comments below.