World Alzheimer’s Day 2026: Theme, Early Symptoms and Latest Research Highlights

Key facts

• World Alzheimer’s Day is observed annually on September 21 as part of World Alzheimer’s Month, held every September.
• The 2026 theme is “The Earlier You Know, The More You Can Do: A Dementia Diagnosis Matters.”
• Alzheimer’s disease is the most common form of dementia, accounting for around 60–70% of cases according to the World Health Organization (WHO).
• WHO data shows more than 57 million people worldwide live with dementia, with nearly 10 million new cases each year.
• WHO’s July 2026 updated guidelines state up to 45% of dementia risk may be attributable to modifiable factors, including physical inactivity, tobacco use, excessive alcohol consumption, social isolation, air pollution, high blood pressure and diabetes.
• The 2024 Lancet Commission identified 14 potentially modifiable dementia risk factors, adding untreated vision loss and high LDL cholesterol.
• In August 2026, the US FDA cleared Roche’s Elecsys pTau217 plasma test and the PrecivityAD2 blood test to aid Alzheimer’s diagnosis in people with signs or symptoms of cognitive impairment.
• Alzheimer’s Disease International says there are currently 158 drugs in 192 trials in the dementia development pipeline, and its 2026 World Alzheimer Report is dedicated to dementia clinical trials.