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Createdon: 15 Mar 2023
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Author: Khoa Tran
Published Mar 15, 2023
Updated Apr 07, 2023

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Alzheimer's Disease


In 1901, Alois Alzheimer was treating a woman named Auguste Deter who exhibited symptoms of memory loss, disorientation, and paranoia. After Deter's death in 1906, Alzheimer examined her brain and observed the presence of abnormal clumps and tangled fibers of protein, which later became known as amyloid plaques and neurofibrillary tangles, respectively. 

At the time, there were no advanced technologies for brain imaging or molecular analysis, so his work relied heavily on the use of a light microscope to study brain tissue samples. These are still considered to be the hallmark pathological features of Alzheimer's disease.

Alzheimer's original report described the examination of brain sections stained with a silver method, which made the plaques and tangles more visible under the microscope. The technology used for this staining method was relatively simple, involving the application of a silver nitrate solution to brain tissue sections, which then reacted with the proteins to produce a visible coloration.

Since then, advances in technology have allowed for more detailed and precise imaging of the brain, including positron emission tomography (PET), magnetic resonance imaging (MRI), and computerized tomography (CT) scans, which can detect structural changes in the brain associated with Alzheimer's disease. There are also more advanced methods for molecular analysis, including the use of genetic sequencing and biomarker assays, which can provide more insight into the underlying causes and mechanisms of the disease.

Alzheimer's disease was initially considered to be a rare condition, but its prevalence became more widely recognized in the mid-20th century. It was not until the 1970s and 1980s that advances in brain imaging and diagnostic techniques allowed for more accurate diagnosis and study of the disease.

The search for a cure or effective treatment for Alzheimer's disease has been ongoing for decades, but progress has been slow. However, there has been a growing understanding of the disease's underlying pathology and risk factors, and there are now several drugs that can provide some relief from symptoms, though they do not cure the disease.

Modern Understanding

Alzheimer's disease (AD) is a progressive neurodegenerative disorder that affects millions of people worldwide. It is the most common cause of dementia in older adults and accounts for 60-70% of all dementia cases. The disease is characterized by the progressive loss of cognitive function, including memory loss, confusion, and difficulty in performing daily activities. Alzheimer's disease is a devastating illness that not only affects the patient but also their family and caregivers.


Alzheimer's disease is a relatively new disease. The disease is named after Dr. Alois Alzheimer, a German psychiatrist and neuropathologist who first identified the disease in 1906.

Dr. Alzheimer's discovery began with a patient named Auguste Deter, a 51-year-old woman who was admitted to the Frankfurt Hospital in 1901 with symptoms of memory loss, confusion, and other cognitive problems. Dr. Alzheimer observed her condition closely and noted that her symptoms were unlike anything he had seen before. He continued to study her for several years, even after she passed away in 1906.

Dr. Alzheimer's research led him to discover that Auguste Deter's brain had significant abnormalities, including the presence of plaques and tangles, which are now considered the hallmark signs of Alzheimer's disease. Dr. Alzheimer presented his findings to the scientific community in 1906, and his work quickly became recognized as a landmark discovery in the field of neurodegenerative diseases.

Following Dr. Alzheimer's discovery, the medical community began to study the disease more closely. However, for many years, the disease was not well understood, and research was limited. It was not until the mid-20th century that researchers began to make significant progress in understanding the causes and mechanisms of Alzheimer's disease.

One of the major breakthroughs in Alzheimer's research came in the 1960s when Dr. Robert Katzman and Dr. John W. Growdon discovered that Alzheimer's disease was a leading cause of dementia in the elderly. Their research helped to establish Alzheimer's disease as a distinct clinical entity and paved the way for further research into the disease.

Throughout the 1970s and 1980s, researchers made significant strides in understanding the genetic and biochemical factors that contribute to Alzheimer's disease. Researchers discovered that the accumulation of beta-amyloid protein and tau protein in the brain played a critical role in the development of the disease.

In the 1990s, the discovery of several genes that are associated with Alzheimer's disease provided further insight into the genetic basis of the disease. One of the most significant discoveries during this time was the identification of the ApoE4 gene, which is associated with an increased risk of developing Alzheimer's disease.

In the years since, research into Alzheimer's disease has continued to advance. Researchers have made significant progress in understanding the molecular mechanisms of the disease and in developing new treatments that may slow or even reverse the disease's progression. However, despite this progress, there is still much that is not understood about the disease, and there is currently no cure for Alzheimer's disease.

Today, Alzheimer's disease remains one of the most significant health challenges facing the world. The disease affects millions of people worldwide and places an enormous burden on families, caregivers, and healthcare systems. As the world's population continues to age, the prevalence of Alzheimer's disease is expected to increase, making it more important than ever to continue research into the disease and to develop new treatments and interventions that can help those affected by the disease.


1. Memory loss: One of the earliest symptoms of Alzheimer's disease is memory loss, particularly short-term memory loss. The person may have difficulty in remembering recent events, names, or conversations. They may also forget appointments or misplace objects, and may frequently ask for the same information repeatedly.
2. Difficulty in planning and organizing: The person with Alzheimer's disease may have difficulty in planning and organizing tasks. They may find it challenging to complete familiar tasks, such as cooking or dressing, and may need help with these activities.
3. Confusion: The person with Alzheimer's disease may become easily confused and disoriented, particularly in unfamiliar surroundings. They may have difficulty in recognizing people they know and may forget where they are or how they got there.
4. Mood swings: Mood swings are common in people with Alzheimer's disease. They may become irritable, anxious, or depressed without any apparent reason. They may also become agitated or restless, particularly in the later stages of the disease.
5. Personality changes: As Alzheimer's disease progresses, the person may experience significant changes in their personality. They may become withdrawn, uncommunicative, or suspicious. They may also exhibit unusual behavior, such as wandering or pacing, and may have difficulty in sleeping.
6. Difficulty in communicating: The person with Alzheimer's disease may have difficulty in communicating. They may struggle to find the right words, and their speech may become increasingly garbled or confused. They may also repeat themselves frequently, and their conversations may become disjointed.
7. Difficulty in performing daily activities: As the disease progresses, the person with Alzheimer's disease may have difficulty in performing basic activities of daily living, such as bathing, dressing, and toileting. They may require assistance with these tasks.
8. Loss of appetite and weight loss: The person with Alzheimer's disease may experience a loss of appetite, which can lead to weight loss. They may forget to eat, or they may not be able to recognize food or utensils, which can make eating difficult.
9. Difficulty in recognizing familiar people and objects: As Alzheimer's disease progresses, the person may have difficulty in recognizing familiar people and objects, such as family members, friends, and household items. They may also have difficulty in recognizing themselves in a mirror.
10. Inability to learn new information: In the later stages of Alzheimer's disease, the person may have difficulty in learning new information. They may forget newly learned information almost immediately or may not be able to retain it at all.

Stages of Alzheimer's disease:

Alzheimer's disease is a progressive condition that typically develops slowly over a period of several years. As the disease progresses, a person's symptoms may become more severe, and they may require increasing levels of support and care. The progression of Alzheimer's disease is typically divided into several stages, which are based on the severity of a person's symptoms. Here are the stages of Alzheimer's disease:

1. Preclinical Alzheimer's disease: In the earliest stage of Alzheimer's disease, there are no outward symptoms of cognitive decline. However, brain changes associated with Alzheimer's disease, such as the accumulation of beta-amyloid plaques, may be detectable through imaging tests or other diagnostic tools.
2. Mild cognitive impairment (MCI): Mild cognitive impairment (MCI) is a stage of cognitive decline that is more severe than the normal age-related cognitive decline but less severe than Alzheimer's disease. People with MCI may experience memory problems or difficulty with other cognitive tasks, but their symptoms are not severe enough to interfere with their daily activities.
3. Early-stage Alzheimer's disease: In the early stage of Alzheimer's disease, a person may begin to experience more pronounced cognitive decline, such as memory loss or difficulty with language. They may also begin to experience changes in mood or behavior, such as depression or anxiety.
4. Middle-stage Alzheimer's disease: In the middle stage of Alzheimer's disease, a person's symptoms become more severe, and they may require increasing levels of support and care. They may experience significant memory loss, confusion, and difficulty with daily activities such as dressing and grooming. They may also experience changes in personality or behavior, such as wandering or agitation.
5. Late-stage Alzheimer's disease: In the late stage of Alzheimer's disease, a person's cognitive and physical decline is severe, and they require around-the-clock care. They may be unable to communicate effectively, and they may experience significant physical limitations such as difficulty with swallowing or walking.

It's important to note that the progression of Alzheimer's disease can vary widely between individuals. Some people may experience a more rapid decline, while others may experience a more gradual decline over a longer period of time. Additionally, some people may experience symptoms that do not fit neatly into these stages.

Although there is currently no cure for Alzheimer's disease, early diagnosis and appropriate treatment can help slow the progression of the disease and improve quality of life for people with Alzheimer's disease and their caregivers. If you or a loved one are experiencing symptoms of Alzheimer's disease, it's important to talk to a healthcare professional as soon as possible to get an accurate diagnosis and develop a treatment plan.

Risk Factors:

1. Age: Age is the most significant risk factor for Alzheimer's disease. The risk of developing the disease increases with age, with most cases occurring in people over the age of 65. In fact, the risk of developing Alzheimer's doubles every five years after the age of 65.
2. Genetics: Genetics plays a role in the development of Alzheimer's disease. People who have a family history of the disease are at a higher risk of developing it themselves. There are several genes that have been identified that are associated with an increased risk of Alzheimer's disease, including the ApoE4 gene.
3. Gender: Women are more likely to develop Alzheimer's disease than men. One reason for this may be that women tend to live longer than men, and age is a significant risk factor for the disease.
4. Lifestyle factors: Several lifestyle factors have been identified that may increase the risk of Alzheimer's disease. These include a diet high in saturated and trans fats, lack of physical activity, smoking, and excessive alcohol consumption.
5. Head injuries: People who have suffered head injuries, particularly those who have experienced repeated head trauma, may be at an increased risk of developing Alzheimer's disease later in life.
6. Chronic diseases: Certain chronic diseases, such as diabetes, high blood pressure, and high cholesterol, have been linked to an increased risk of Alzheimer's disease.
7. Environmental factors: Exposure to certain environmental toxins, such as pesticides and heavy metals, may increase the risk of developing Alzheimer's disease.


1. Medical history and physical examination: The first step in diagnosing Alzheimer's disease is typically a medical history and physical examination. This may involve a review of the person's medical history, including any medications they are taking, as well as a physical examination to assess overall health.
2. Cognitive assessments: Cognitive assessments are typically used to evaluate a person's memory, thinking, and other cognitive functions. These assessments may involve tasks such as recalling words, identifying objects, and solving problems. The results of these assessments can help doctors determine whether a person's cognitive decline is consistent with Alzheimer's disease.
3. Neurological tests: Neurological tests are used to assess brain function and may involve tests such as brain imaging or spinal fluid analysis. These tests can help doctors identify any structural or chemical abnormalities in the brain that may be indicative of Alzheimer's disease.
4. Laboratory tests: Laboratory tests may be used to rule out other possible causes of cognitive decline, such as thyroid problems or vitamin deficiencies.
5. Psychological assessments: Psychological assessments may be used to assess a person's mood and emotional well-being, as well as their ability to perform daily activities and manage their daily routines.


The exact cause of Alzheimer's disease is not yet known, but research suggests that a combination of genetic, environmental, and lifestyle factors may play a role in its development. The disease is believed to be caused by the accumulation of beta-amyloid plaques and tau protein tangles in the brain, which damage and kill brain cells.


There is currently no cure for Alzheimer's disease, but there are treatments available that can help manage the symptoms of the disease and improve the quality of life of patients. The medications currently approved by the US Food and Drug Administration (FDA) for the treatment of Alzheimer's disease are cholinesterase inhibitors and memantine. These drugs can help improve cognitive function, mood, and behavior in some patients. In addition, non-drug interventions such as cognitive training, physical exercise, and social activities can also help improve cognitive function and delay the progression of the disease.


Although there is no known way to prevent Alzheimer's disease, there are some steps that people can take to reduce their risk of developing the disease. These include maintaining a healthy lifestyle, such as eating a healthy diet, exercising regularly, not smoking, and reducing stress. In addition, staying mentally and socially active can also help reduce the risk of cognitive decline and dementia.