Alzheimer’s Disease: Causes, Symptoms, Stages, and Prevention

Alzheimer’s, the primary cause of dementia, is most often recognized by memory loss. The primary symptom associated with the disease is that it diminishes people’s memory. At first, people with Alzheimer’s struggle to recollect recent events; however, they may easily remember things that happened years ago. This particular illness is not permanent, and a person can live with Alzheimer’s disease for just a few years or a few decades. More often, people live with it for about 9 years.

Causes

Alzheimer’s disease does not have one single cause. It develops from a mix of biological, genetic, and lifestyle factors that affect how brain cells work.

Over time, abnormal proteins build up in the brain. These proteins damage and kill brain cells, which leads to problems with memory and thinking. The disease may begin many years before symptoms appear.

Possible contributing factors include:

• Changes in brain chemicals needed for learning and memory
• Inflammation and stress in brain cells
• Genetic factors, especially in early-onset cases
• Age-related changes that reduce the brain’s ability to repair and clean itself

Age is the biggest risk factor. Lifestyle habits and heart health may also play a role. Alzheimer’s develops slowly as brain function breaks down over time.

Symptoms

Alzheimer’s disease develops slowly. Symptoms get worse over time and affect memory, thinking, communication, and behaviour.

Early Stage

Early signs are often mild but start to affect daily life.

• Forgetting recent events or conversations
• Misplacing items
• Trouble finding the right words
• Confusion in familiar places
• Taking longer to do routine tasks

Mid Stage

Symptoms become more noticeable and challenging.

• Trouble recognizing family or friends
• Getting lost in familiar places
• Difficulty planning or handling money
• Mood changes such as anxiety, irritability, or withdrawal
• Repetitive speech or actions

Late Stage

Severe symptoms affect independence and physical health.

• Major memory loss, even forgetting loved ones
• Needing help with eating, dressing, and bathing
• Limited speech
• Trouble walking, swallowing, or controlling bladder
• Personality and behaviour changes, including delusions or hallucinations

Stages

Stage 1 – Normal Outward Behaviour

Alzheimer’s disease starts affecting the brain slowly, and symptoms are not shown at the beginning of the disease. Only the PET scan can reveal whether or not a person is affected by it.

Stage 2 – Very Mild Changes

A person still doesn’t notice any difference in the behaviour, sometimes they might pick up small changes like forgetting words and misplacing objects.

Stage 3 – Mild Decline

This is when people notice the change in the patient’s behaviour. They ask questions over and over again, have difficulties in organising and can’t remember names when meeting new people.

Stage 4 – Moderate Decline

Stage 3’s symptoms get more obvious, and new issues also appear. They forget details about themselves, forget the month, have trouble cooking food, struggle to use the telephone, and won’t be able to understand what was said to them.

Stage 5 – Moderately Severe Decline

A person may begin losing awareness of time and place, struggling to recall their address, phone number, or even their school. They might also feel uncertain about what clothes are suitable for the day or season. While remembering specific facts and details becomes difficult, they may still manage to share stories.

Stage 6 – Severe Decline

As Alzheimer’s progresses, they might recognize faces but forget names. They may sometimes confuse one person for another, such as mistaking their wife for their mother. Delusions can also occur, like believing they need to go to work even though they no longer have a job. In this stage, they might lose weight, they might notice changes in their sleep patterns, trouble walking. One might have to feed them and get dressed, also.

Stage 7 – Very Severe Decline

In this stage, people with Alzheimer’s disease need a lot of help from families or caregivers. Many people at this stage can no longer tell if they’re thirsty. During this stage, even basic abilities like eating, walking, and sitting up gradually decline in a person with Alzheimer’s.

Risk Factors

Alzheimer’s disease develops due to a mix of different risk factors. These include age, genetics, health conditions, and lifestyle habits.

• Advancing age: Risk increases greatly after age 65, though early-onset cases can occur earlier.
• Genetics: A family history or rare inherited gene changes can raise the risk.
• Heart and metabolic health: High blood pressure, diabetes, stroke, and high cholesterol are linked to higher risk.
• Head injury: Serious head trauma, especially with loss of consciousness, may increase risk.
• Low mental and social activity: Less brain stimulation and social interaction may raise vulnerability.
• Mental health conditions: Long-term depression, anxiety, or stress may affect brain health.
• Unhealthy lifestyle: Lack of exercise, poor diet, smoking, and heavy alcohol use can harm brain function.
• Hearing loss: Untreated hearing problems in midlife may be linked to higher dementia risk.

Diagnosis

There is no single test to confirm Alzheimer’s disease. Doctors use several steps to make a diagnosis.

• Medical history and exam: The doctor asks about your symptoms, daily life, and medical history. Family members may share changes they have noticed. A physical and neurological exam helps rule out other causes.
• Memory and thinking tests: Cognitive tests check memory, language, and problem-solving skills. These tests show how thinking abilities are affected.
• Lab tests: Blood and urine tests help rule out other conditions. Some newer blood tests can measure proteins linked to Alzheimer’s.
• Brain imaging: MRI, CT, and PET scans create images of the brain. These scans look for changes linked to Alzheimer’s and rule out other problems like stroke or tumors.
• Biomarker tests: Some tests measure amyloid and tau proteins in blood or spinal fluid. These help doctors better identify Alzheimer’s and its stage.

Doctors combine results from all these tests to make a diagnosis and plan care.

Treatment

There is no cure for Alzheimer’s disease, but treatment can help manage symptoms and slow decline, especially in early stages.

Medicines

• Cholinesterase inhibitors help with memory, thinking, and some behavior symptoms.
• Memantine is used in moderate to severe stages to support brain function.
• Some newer IV medicines target amyloid proteins and may slow disease progression in early Alzheimer’s.
• Other medicines may treat depression, anxiety, agitation, sleep problems, or hallucinations.

Lifestyle and Support

• Stay socially active and exercise regularly
• Manage other health conditions
• Keep a simple daily routine

Safe Home Environment

• Keep important items in fixed places
• Use calendars and reminders
• Remove clutter and install handrails
• Use safety alarms or ID if needed

Doctors create treatment plans based on each person’s needs. Research and clinical trials are ongoing.

Prevention Tips

• Physical fitness and mental fitness go hand-in-hand. Regular exercise can prevent mindfulness and memory loss.
• Keeping the mind active and stimulating the brain can help protect against memory loss by strengthening the connections between brain cells that support memory.
• Staying connected and engaging with others helps lower stress and prevent depression, which can contribute to memory loss.
• Sleeping well can help rest and restore your brain; it also helps consolidate memory.
• Quit smoking and drink moderately.

If your family members show any of these symptoms, it is a good idea to seek professional help. Although there is no cure for this illness, the symptoms can be temporarily improved with continuous medication and treatment.

When to See a Doctor

If you or a loved one is experiencing memory loss or problems with thinking, it’s important to consult a healthcare professional. While Alzheimer’s may be a cause, other medical conditions can also lead to similar symptoms, and some of them are treatable.

If you notice signs in someone close to you, consider offering to accompany them to the appointment. After a diagnosis, regular check-ups help monitor the condition and adjust care as needed.

Frequently Asked Questions