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<ul> <li>Alzheimer's disease is a neurological disorder that gets worse over time and that affects thinking and reasoning abilities. It is the most common cause of dementia, accounting for up to 70% of all cases.</li> <li>The disease is defined by the presence of abnormal protein deposits in the brain, including amyloid plaques and tau tangles, which disrupt normal brain function and lead to the death of brain cells.</li> <li>Symptoms start slowly and get worse over time, and include memory loss, trouble with thinking and language, and changes in mood or behavior. As it gets worse, people may need more help with basic tasks like eating and getting dressed. There's no cure, but medicines and lifestyle changes like exercise and a healthy diet can help manage symptoms and make life better.</li> </ul>