Alzheimer’s disease is a progressive neurodegenerative disorder and the most common cause of dementia. It gradually affects memory, thinking, language, orientation, and other cognitive functions. As the disease progresses, it can significantly affect a person’s behavior, independence, and ability to perform everyday activities.
Pathological changes in the brain may begin many years before the first noticeable symptoms appear. Characteristic features of the disease include the accumulation of beta-amyloid plaques between nerve cells and abnormal forms of the tau protein within them. These changes are associated with progressive neuronal dysfunction and loss.
In the early stages, brain regions that are important for forming new memories, such as the hippocampus, are often affected. As the disease progresses, more areas of the brain become involved, resulting in broader cognitive and functional difficulties.
Symptoms of Alzheimer’s Disease
The symptoms of Alzheimer’s disease usually develop gradually and worsen over time.
One of the most common early symptoms is impairment of recent memory. A person may forget recent conversations or events, repeatedly ask the same questions, or have difficulty remembering new information.
Other symptoms may include:
- Difficulty learning and retaining new information
- Repeating questions or conversations
- Difficulty finding the right words
- Difficulty with planning and problem-solving
- Problems managing finances or other complex daily activities
- Difficulty with orientation in time or place
- Difficulty recognizing familiar people in more advanced stages
- Reduced judgment and decision-making ability
- Loss of initiative and interest in activities
- Changes in mood, personality, or behavior
In the early stages, a person may remain largely independent but may require more time or effort to perform complex everyday activities.
Progression of Alzheimer’s Disease
Alzheimer’s disease progresses gradually, although the rate of progression varies considerably from person to person.
As the disease advances, greater difficulties may develop with memory, communication, orientation, and the performance of daily activities.
In more advanced stages, symptoms may include:
- Significant disorientation in time and place
- Difficulty recognizing relatives and familiar people
- Significant language and communication difficulties
- Difficulty with dressing, personal hygiene, and eating
- Sleep disturbances
- Wandering or motor restlessness
- Apathy
- Irritability or aggression
- Hallucinations or delusions in some patients
In advanced stages, the person may require substantial or continuous assistance with activities of daily living.
Risk Factors for Alzheimer’s Disease
Age is the most important known risk factor for Alzheimer’s disease, although the condition is not a normal part of aging.
Other factors that may be associated with an increased risk include:
- Family history of dementia
- Certain genetic factors
- High blood pressure
- Diabetes mellitus
- High cholesterol and other cardiovascular risk factors
- Smoking
- Obesity
- Physical inactivity
- Social isolation
- Traumatic brain injury
- Certain sleep disorders
The presence of one or more risk factors does not necessarily mean that a person will develop Alzheimer’s disease.
Diagnosis of Alzheimer’s Disease
The diagnosis of Alzheimer’s disease is based on a combination of medical history, neurological examination, cognitive assessment, and appropriate diagnostic investigations.
The diagnostic evaluation may include:
Neurological examination: The overall function of the nervous system is assessed, and signs that may suggest other neurological conditions are investigated.
Cognitive assessment: Specific tests are used to evaluate memory, attention, language, orientation, visuospatial abilities, and executive functions.
Neuropsychological assessment: In some cases, a more detailed evaluation of individual cognitive functions may be performed.
Brain Magnetic Resonance Imaging (MRI): MRI is used to assess the structure of the brain and to exclude or identify other causes of cognitive decline, such as vascular lesions, tumors, or other pathological conditions.
Laboratory tests: Blood tests can help exclude other potentially reversible causes of cognitive impairment, including certain metabolic, endocrine, or nutritional disorders.
Biomarkers for Alzheimer’s Disease
Modern diagnostic evaluation of Alzheimer’s disease may, in selected cases, include biomarkers that help detect the underlying pathology of the disease.
Depending on the individual case and availability, these may include:
- Cerebrospinal fluid biomarkers
- Amyloid or tau PET imaging
- Specific blood-based biomarkers, such as phosphorylated forms of tau
- Other specialized investigations when there is a specific clinical indication
These tests are not necessary for every patient. Their use depends on the person’s age, symptoms, stage of cognitive impairment, and the specific clinical question being investigated.
Treatment of Alzheimer’s Disease
The treatment of Alzheimer’s disease is individualized according to the stage of the disease, cognitive and behavioral symptoms, the patient’s general health, and the needs of the family and caregivers.
Management may include symptomatic medication aimed at supporting cognitive function when clinically appropriate.
In recent years, disease-modifying treatments targeting amyloid have also been developed for selected patients with early symptomatic Alzheimer’s disease. These treatments are not suitable for everyone and require confirmation of Alzheimer’s pathology, careful patient selection, and specialized monitoring.
Individualized treatment may also be required for symptoms such as:
- Depression and anxiety
- Sleep disturbances
- Irritability and agitation
- Hallucinations or delusions
- Other behavioral changes
Cognitive Stimulation and Daily Functioning
The management of Alzheimer’s dementia is not limited to medication.
Cognitive stimulation, regular physical activity, social engagement, and maintaining a structured daily routine can be important components of overall care.
Particular attention should also be given to:
- Maintaining regular physical activity
- Social and cognitive engagement
- A balanced and nutritious diet
- Addressing hearing and vision problems
- Maintaining good sleep quality
- Managing cardiovascular risk factors
- Ensuring safety at home and during everyday activities
The aim is to preserve independence and functional abilities for as long as possible.
Follow-Up of Alzheimer’s Disease
Regular neurological follow-up is important for monitoring changes in cognitive function, everyday functioning, and behavioral or psychological symptoms.
Follow-up also allows treatment to be reassessed and new problems that may affect the patient’s condition to be identified at an early stage.
Support for family members and caregivers is also an important part of overall management, particularly as care needs increase.
Early diagnosis of Alzheimer’s disease, appropriate treatment, cognitive and physical stimulation, and regular follow-up can help preserve functional abilities and improve the quality of life of both the patient and their family.