Alzheimer's Disease: Symptoms, Causes & Treatment

Alzheimer's Disease is a progressive neurodegenerative disorder characterized by irreversible decline in memory, thinking, and behavioral abilities. It accounts for 60-80% of dementia cases worldwide, particularly affecting individuals over 65 years old. In Jordan and the Middle East, the incidence is rising with population aging, placing significant burden on family caregivers and healthcare systems.

The disease develops due to accumulation of harmful proteins (beta-amyloid and tau tangles) in the brain, leading to neuronal death and brain tissue atrophy. Symptoms begin with mild forgetfulness and progressively worsen to complete memory loss and loss of independence. Although no cure currently exists, early detection and available treatments can slow disease progression and improve quality of life for both patients and families.

Recent research indicates that genetic factors, unhealthy lifestyle, chronic diseases (diabetes and hypertension), and family history significantly increase risk. Early detection through neurological examination and brain imaging enables early treatment initiation before advanced disease stages develop.

Alzheimer's symptoms vary by disease stage and develop gradually over years. Early-stage symptoms may be subtle and easily overlooked. There is no significant gender difference in symptom presentation, though women may experience more accompanying psychological symptoms. Consult a physician immediately if any of the following signs appear:

• Short-term memory loss: Forgetting recent events, names, and appointments repeatedly.
• Difficulty speaking and expressing thoughts: Struggling to find words or confusion during conversation.
• Loss of focus and attention: Inability to follow conversations or complete tasks.
• Confusion and disorientation: Especially regarding time, date, and place.
• Mood and behavioral changes: Depression, anxiety, and unexplained irritability.
• Loss of interest in favorite activities: Withdrawal from hobbies and social engagement.
• Difficulty with routine tasks: Forgetting how to perform daily activities like cooking or bathing.
• Getting lost in familiar places: Difficulty finding way around home or neighborhood.
• Poor judgment and decision-making: Making unwise or dangerous decisions without awareness.
• Hallucinations and delusions: Seeing non-existent things or believing false information.
• Sleep problems: Insomnia or excessive daytime sleepiness.
• Aggression or unusual behavior: Inappropriate responses to situations.

• Beta-amyloid accumulation: Extracellular protein deposits trigger inflammation and neuronal death.
• Tau tangles formation: Intracellular tau protein accumulation disrupts nutrient transport, causing cell death.
• Chronic neuroinflammation: Sustained inflammatory response accelerates neuronal degeneration.
• Impaired neuronal clearance: Brain's inability to efficiently remove excess and damaged proteins.
• Mitochondrial dysfunction: Reduced energy production capacity due to mitochondrial damage in neurons.
• Synaptic transmission failure: Disrupted neural communication caused by toxic protein accumulation.
• Genetic mutations: Changes in APOE ε4, APP, PSEN1, and PSEN2 genes increase susceptibility.
• Oxidative stress: Accumulation of harmful molecules causing neuronal damage.

• Advanced age: Risk increases significantly after 65 years, affecting 30-40% of people over 85.
• Family history and genetics: Having affected parents or siblings increases risk up to 30%.
• APOE ε4 gene: Carriers (especially homozygous) have 8-12 times higher risk.
• Uncontrolled hypertension: Damages cerebral blood vessels.
• Type 2 diabetes: Increases Alzheimer's risk by 50-60%.
• Obesity: Particularly in middle age, promotes neuroinflammation.
• Physical inactivity: Reduces cerebral blood flow.
• Low education level: May reduce cognitive reserve.
• Depression and social isolation: Especially prolonged, accelerate cognitive decline.
• Repeated head injuries: Particularly in contact sports or accidents.

Alzheimer's diagnosis relies on comprehensive clinical, psychological, and neuroimaging assessments. No single definitive test exists; diagnosis requires thorough evaluation by a neurologist at specialized clinics. Final diagnosis is only confirmed post-mortem through brain tissue examination, but clinical diagnosis achieves 90% accuracy when performed correctly. In Jordan, these services are available at major hospitals and specialized clinics in Amman and major cities.

• Clinical evaluation and medical history: Comprehensive assessment by neurologist including symptom history and past medical conditions.
• Cognitive screening tests (MMSE, MoCA): Standardized tests measuring memory, concentration, and cognitive abilities (normal score > 26/30).
• Laboratory tests: Blood work including Alzheimer's biomarkers (phospho-tau, phospho-181), general chemistry, lipids, and glucose levels.
• Magnetic Resonance Imaging (MRI): Shows brain tissue atrophy (especially temporal lobe), rules out stroke or tumors.
• Positron Emission Tomography (PET) scan: Detects beta-amyloid and tau accumulation in brain (more specific but less accessible).
• Psychological and neurological assessment: Screening for depression, anxiety, and other neurological signs.

Medications

• Cholinesterase inhibitors: Donepezil, rivastigmine, and tacrine increase acetylcholine levels in the brain, improving neural communication. Used in all disease stages; may slow decline for 6-12 months.
• Memantine: NMDA receptor antagonist protects neurons from excessive glutamate toxicity. Typically combined with cholinesterase inhibitors in moderate to advanced stages.
• Lecanemab (Leqembi): Novel biological drug directly targeting beta-amyloid, slowing cognitive decline by 35% in very early stages (requires confirmation of amyloid accumulation via PET or CSF biomarkers).
• Supportive medications: SSRIs for accompanying depression, anxiolytics, and sleep aids as needed.

Procedures and Therapies

• Cognitive Behavioral Therapy (CBT): Regular sessions with psychologist to improve coping and manage psychological symptoms.
• Memory Rehabilitation: Targeted exercises to strengthen remaining memory and manage memory loss.
• Art and Music Therapy: Proven to improve mood and reduce aggressive behavior.
• Family Support and Counseling: Educational programs for patients and families on disease management and adaptation.

Lifestyle Changes

• Regular physical activity: Light to moderate exercise (30-minute daily walk) improves cerebral blood flow and slows cognitive decline.
• Healthy diet (Mediterranean diet): Rich in fish, vegetables, fruits, and olive oil; reduces neuroinflammation.
• Mental stimulation: Puzzles, reading, and continuous learning strengthen cognitive reserve.
• Adequate sleep: 7-8 hours daily helps brain clear harmful proteins during sleep.
• Stress management: Relaxation and meditation reduce neuroinflammation.
• Social engagement: Regular social interaction improves psychological and cognitive health.
• Chronic disease management: Regular medication adherence for blood pressure, diabetes, and cholesterol control.
• Avoid harmful substances: Smoking cessation and alcohol avoidance reduce inflammation and oxidative stress.

• Acute delirium: Episodes of severe confusion and agitation, especially with infections or medication changes; can be life-threatening if untreated.
• Falls and injuries: Balance and coordination disorders increase fall risk and fractures, especially hip fracture, leading to serious complications and mobility loss.
• Malnutrition and dehydration: Swallowing difficulty and forgetfulness about eating cause rapid weight loss and general weakness.
• Infections (pneumonia and urinary tract infections): Weakened immunity and immobility increase infection risk, including aspiration pneumonia which can be fatal.
• Urinary and fecal incontinence: Loss of control over excretion affects dignity and personal hygiene.
• Pressure ulcers: Skin ulcers from prolonged sitting without movement; prone to serious secondary infections.
• Depression and suicidal ideation: Especially in early stages when patients recognize their condition; may lead to suicide attempts.
• Severe dementia and complete disability: In terminal stages, total loss of communication, movement, and independence requiring continuous medical care.

• Regular physical exercise: 150 minutes weekly of moderate activity (walking, swimming) improves cardiovascular and brain health, reducing risk by 30%.
• Balanced healthy diet: Particularly Mediterranean diet, rich in antioxidants, healthy fats (omega-3), and fiber.
• Blood pressure control: Maintaining BP < 130/80 mmHg reduces Alzheimer's risk by 20-30%.
• Diabetes management: Keeping HbA1c < 7% reduces neuroinflammation and oxidative stress.
• Healthy weight maintenance: Avoid obesity (BMI 18.5-24.9), especially in middle age.
• Continuous mental stimulation: Learning, reading, and mental puzzles strengthen cognitive reserve and protect against decline.
• Maintain social connections: Regular social activities reduce isolation and improve mental health.
• Quality sleep: 7-8 hours daily helps brain clear harmful proteins during sleep.
• Smoking and alcohol cessation: Harmful substances cause neuroinflammation and neuronal damage.
• Regular medical follow-up: Periodic check-ups to manage chronic diseases and detect illness early.