Alzheimer's

Extracted Attributes

• Commonality

  60-70% of dementia cases

• Mortality Rank

  7th leading cause of death worldwide

• Life Expectancy

  3 to 12 years post-diagnosis

• Global Prevalence

  50 million people (2020)

• Global Annual Cost

  US$1 trillion (2020)

• Genetic Risk Factor

  Apolipoprotein E allele

• Primary Risk Factor

  Age (65 and older)

• Pathological Markers

  Amyloid plaques and neurofibrillary tangles

Timeline

• German psychiatrist Alois Alzheimer first describes the disease. (Source: undefined)

  1906-01-01

• Global prevalence reaches 50 million people with an annual cost of US$1 trillion. (Source: undefined)

  2020-12-31

• US NIH research budget for Alzheimer's set at US$3.98 billion for the fiscal year. (Source: undefined)

  2026-01-01

Alzheimer's disease

Alzheimer's disease (AD) is a neurodegenerative disease and is the most common form of dementia, accounting for around 60–70% of cases. The most common early symptom is difficulty in remembering recent events. As the disease advances, symptoms can include problems with language, disorientation (including easily getting lost), mood swings, loss of motivation, self-neglect, and behavioral issues. As a person's condition declines, they often withdraw from family and society. Gradually, bodily functions are lost, ultimately leading to death. Although the speed of progression can vary, the average life expectancy following diagnosis is three to twelve years. The causes of Alzheimer's disease remain poorly understood. There are many environmental and genetic risk factors associated with its development. The strongest genetic risk factor is from an allele of apolipoprotein E, a protein involved in the metabolism of fats in mammals. Other risk factors include a history of head injury, clinical depression, and high blood pressure. The progression of the disease is largely characterised by the accumulation of malformed protein deposits in the cerebral cortex, called amyloid plaques and neurofibrillary tangles. These misfolded protein aggregates interfere with normal cell function, and over time lead to irreversible degeneration of neurons and loss of synaptic connections in the brain. A probable diagnosis is based on the history of the illness and cognitive testing, with medical imaging and blood tests to rule out other possible causes. Initial symptoms are often mistaken for normal brain aging. Examination of brain tissue is needed for a definite diagnosis, but this can only take place after death. No treatments can stop or reverse its progression, though some may temporarily improve symptoms. A healthy diet, physical activity, and social engagement are generally beneficial in aging, and may help in reducing the risk of cognitive decline and Alzheimer's. Affected people become increasingly reliant on others for assistance, often placing a burden on caregivers. The pressures can include social, psychological, physical, and economic elements. Exercise programs may be beneficial with respect to activities of daily living and can potentially improve outcomes. Behavioral problems or psychosis due to dementia are sometimes treated with antipsychotics, but this has an increased risk of early death. As of 2020, there were approximately 50 million people worldwide with Alzheimer's disease. It most often begins in people over 65 years of age, although up to 10% of cases are early-onset impacting those in their 30s to mid-60s. It affects about 6% of people 65 years and older, and women more often than men. The disease is named after German psychiatrist and pathologist Alois Alzheimer, who first described it in 1906. Alzheimer's financial burden on society is large, with an estimated global annual cost of US$1 trillion. Alzheimer's and related dementias are ranked as the seventh leading cause of death worldwide. Given the widespread impacts of Alzheimer's disease, both basic-science and health funders in many countries support Alzheimer's research at large scales. For example, the US National Institutes of Health program for Alzheimer's research, the National Plan to Address Alzheimer's Disease, has a budget of US$3.98 billion for fiscal year 2026. In the European Union, the 2020 Horizon Europe research programme awarded over €570 million for dementia-related projects.

Web Search Results

• What Causes Alzheimer's Disease? - National Institute on Aging - NIH

  Caregiver helping an older woman with Alzheimer's disease Alzheimer’s disease is a brain disorder that slowly destroys memory and thinking skills, and eventually, the ability to carry out the simplest tasks. The disease is the most common form of dementia among older adults. Symptoms include the loss of cognitive functioning — thinking, remembering, and reasoning — and the loss of behavioral abilities. Eventually, this loss of functioning increases to where it interferes with a person’s daily life and activities. [...] Genes are passed down from your biological parents. They carry information that defines traits such as eye color and height. Variations in genes — even small changes — can affect the likelihood of a person developing a disease such as Alzheimer’s. In most cases, Alzheimer’s does not have a single genetic cause. Instead, it can be influenced by multiple genes in combination with lifestyle and environmental factors. A person may carry more than one genetic variant or group of variants that can either increase or reduce the risk of Alzheimer’s. [...] Research suggests that a host of factors beyond age and genetics may play a role in the development and course of Alzheimer’s. For example, there is significant interest in the relationship between cognitive decline and vascular conditions such as heart disease, stroke, and high blood pressure. Scientists are also looking at the role of metabolic diseases, such as diabetes and obesity. In addition, other medical conditions associated with a higher risk of Alzheimer’s include: In time, research may help scientists understand whether reducing risk factors for these health conditions could also reduce the risk for Alzheimer’s.

• What is Alzheimer's Disease? Symptoms & Causes | alz.org

  ## Understanding Alzheimer's and dementia Alzheimer's is the most common cause of dementia, a general term for memory loss and other cognitive abilities serious enough to interfere with daily life. Alzheimer's disease accounts for 60-80% of dementia cases. Learn more: What is the Difference Between Dementia and Alzheimer's?, What is Dementia, Research and Progress Alzheimer's is not a normal part of aging. The greatest known risk factor is increasing age, and the majority of people with Alzheimer's are 65 and older. Alzheimer's disease is considered to be younger-onset Alzheimer's if it affects a person under 65. Younger-onset can also be referred to as early-onset Alzheimer's. People with younger-onset Alzheimer's can be in the early, middle or late stage of the disease. [...] Alzheimer's changes typically begin in the part of the brain that affects learning. As Alzheimer's advances through the brain it leads to increasingly severe symptoms, including disorientation, mood and behavior changes; deepening confusion about events, time and place; unfounded suspicions about family, friends and professional caregivers; more serious memory loss and behavior changes; and difficulty speaking, swallowing and walking. [...] The most common early symptom of Alzheimer's is difficulty remembering newly learned information. Just like the rest of our bodies, our brains change as we age. Most of us eventually notice some slowed thinking and occasional problems with remembering certain things. However, serious memory loss, confusion and other major changes in the way our minds work may be a sign that brain cells are failing.

• About Alzheimer's | Alzheimer's Disease and Dementia - CDC

  # About Alzheimer's ## Key points Alzheimer’s disease is the most common type of dementia. Early symptoms typically appear after age 60, and the risk increases with age. Learn more about Alzheimer's disease, including who it affects, warning signs, and what to do if you think you or a loved one might have it. ## Overview ### Alzheimer’s disease While some changes in memory and thinking are a normal part of aging, Alzheimer's is not. Alzheimer's disease is the most common type of dementia. Dementia is a general term for the loss of memory, problem-solving and thinking abilities thatinterferes with daily life. #### Alzheimer's disease is... [...] #### Alzheimer's disease is... A brain disorder caused by damage to nerve cells in the brain. Progressive, meaning that it develops gradually over time. + It begins with mild memory loss and can lead to the inability to carry on a conversation, carry out daily activities, or respond to the environment. Irreversible, meaning the damage it does to the brain cannot be undone. ### Who gets Alzheimer's disease The risk of getting this disease increases with age. Alzheimer's typically affects people aged 60 or older. Younger people can get Alzheimer's disease, but it is less common. + In some cases, early signs can appear as early as the mid-40s. This is known as early-onset Alzheimer's disease. ### The number of people with Alzheimer’s disease ### Did you know? [...] ### Causes We do not yet fully understand what causes Alzheimer's disease. There likely is not one single factor, but rather a combination of factors that cause the disease. These factors, which may affect each person differently, include: Genes. Family history. Environmental factors. Lifestyle behaviors. ## Signs and symptoms ### Symptoms of Alzheimer’s disease In addition to memory problems, someone with Alzheimer's disease may experience one or more of these problems: Memory loss that disrupts daily life. Trouble handling money or paying bills. Difficulty completing familiar tasks at home, at work, or at leisure. Decreased or poor judgment. Misplacing things and being unable to retrace steps to find them. Changes in mood, personality, or behavior.

• Alzheimer's Disease: Symptoms & Treatment - Cleveland Clinic

  Advertisement Advertisement Alzheimer’s Disease Medically Reviewed.Last updated on 02/19/2025. Alzheimer’s disease is a brain condition that slowly damages your memory, thinking, learning and organizing skills. It’s the most common cause of dementia. Symptoms usually first appear in people older than 65. There’s no cure, but medications may manage symptoms and slow its progression. Advertisement Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services.Policy Care at Cleveland Clinic Alzheimer's Disease Treatment Find a Doctor and Specialists Make an Appointment Advertisement Advertisement Advertisement Advertisement [...] Show Navigation More Back to video is the most common cause of dementia. Alzheimer’s is pronounced “alz-HAI-mers.” It’s a neurodegenerative disease that affects your brain. This means it damages and destroys cells in your brain over time. Eventually, people with AD lose some of their brain functions, including memory and language. Advertisement Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services.Policy Alzheimer’s disease affects approximately 24 million people worldwide. One in 10 people older than 65 have it. Nearly 1 in 3 people older than 85 have AD.

• 10 Early Signs and Symptoms of Alzheimer's & Dementia | alz.org

  Memory loss that disrupts daily life may be a symptom of Alzheimer's or other dementia. Alzheimer's is a brain disease that causes a slow decline in memory, thinking and reasoning skills. There are 10 warning signs and symptoms. If you notice any of them, don't ignore them. Schedule an appointment with your doctor. The Alzheimer's Association is here to help any time, any day of the year. Call our free 24/7 Helpline at 800.272.3900 to talk to a live person who can answer your questions. Not sure what to ask or where to start? That's okay, too. Just give us a call and we'll guide you from there. Image 22 1 Memory loss that disrupts daily life [...] 2 Challenges in planning or solving problems Some people living with changes in their memory due to Alzheimer's or other dementia may experience changes in their ability to develop and follow a plan or work with numbers. They may have trouble following a familiar recipe or keeping track of monthly bills. They may have difficulty concentrating and take much longer to do things than they did before. What's a typical age-related change? Making occasional errors when managing finances or household bills. 3 Difficulty completing familiar tasks People living with memory changes from Alzheimer's or other dementia often find it hard to complete daily tasks. Sometimes they may have trouble driving to a familiar location, organizing a grocery list or remembering the rules of a favorite game. [...] Image 22 1 Memory loss that disrupts daily life One of the most common signs of Alzheimer’s disease, especially in the early stage, is forgetting recently learned information. Others include forgetting important dates or events, asking the same questions over and over, and increasingly needing to rely on memory aids (e.g., reminder notes or electronic devices) or family members for things they used to handle on their own. What's a typical age-related change? Sometimes forgetting names or appointments, but remembering them later. 2 Challenges in planning or solving problems