The word dementia describes a set of symptoms that may include memory loss and difficulties with thinking, problem-solving or language. It's caused when the brain is damaged by diseases, such as Alzheimer's disease or a series of strokes, and is progressive, which means the symptoms will gradually get worse. Dementia can happen to anyone and there's currently no cure. There are 850,000 people with dementia in the UK, and the number is set to rise to 1 million by 2021. The Alzheimer's Society believes passionately that life doesn't end when dementia begins. They are there for anyone affected by dementia, and they do everything they can to keep people with dementia connected to their lives and the people who matter most.