Apr 4th 2023
Dementia is a progressive disease, meaning symptoms get worse over time. The rate of deterioration varies from person to person.
Various risk factors, such as age and underlying health conditions, affect the rate of progression. However, for some people, dementia can progress suddenly and swiftly.
Whilst dementia usually worsens gradually over time, it can also come on suddenly. The way dementia will affect a person is challenging to predict. A person might exhibit mild symptoms for a protracted period and then suddenly get worse. On the other hand, they may deteriorate quickly and then level out for a sustained period.
The rate at which dementia progresses can depend on the type of dementia a person has. For example, Alzheimer’s disease is characterized by mild symptoms in the early stages which gradually worsen over time. The same is true of vascular dementia. However, vascular dementia can also develop suddenly, with sufferer’s deteriorating quickly. 
Rapidly progressive dementias (RPDs) are neurological disorders that progress quickly over weeks or months after onset of symptoms, and in rare cases over days.  RPDs are rare and difficult to diagnose, so it is critical to assess a prospective RPD patient in a hospital setting as quickly as possible.  RPDs are often the type of dementia that progress the fastest.
Many RPDs are treatable, and some can be reversed if diagnosed quickly. But for some RPDs, there are no cures, and symptoms worsen quickly.
Many medical conditions can lead to rapidly progressive dementia, with causes including: 
Exposure to anticholinergic drugs can increase the risk of dementia and worsen the symptoms of dementia.  Anticholinergics are used to treat a range of conditions including allergies, mood disorders, gastrointestinal disorders, and bladder disorders.
Cognitive impairment and memory loss can be disruptive and disorientating for people with dementia. They often rely on their routines as sources of comfort and stability. A sudden change to the routine can feel stressful, frightening, and can worsen dementia symptoms. 
Examples that could cause worsening dementia symptoms include: 
Delirium is a condition that commonly affects people with dementia and causes them to feel suddenly bewildered and distressed.
Delirium is thought to be triggered in dementia patients by a number of medical disturbances including, but not limited to, sudden hospitalization, infection, and surgery. 
Studies show that patients with dementia who develop delirium have higher mortality rates. Delirium has been found to accelerate cognitive decline in patients with Alzheimer’s disease. 
The moment you notice someone with dementia experiencing worsening symptoms, you should contact a doctor.
While you may have previously felt comfortable treating a person’s symptoms, a deterioration in condition requires a re-evaluation from a medical professional to see if a new treatment plan is required.
If the dementia patient can communicate how they feel, write down this information. Provide this information to the doctor as it may be helpful in determining the course of treatment.