Dementia

The disease disrupts key areas of brain function:  

• Memories – often having difficulty remembering people, events, where they've put things and places 

• Thoughts – speed of thought and mental sharpness declines

• Reasoning – difficulty finding words, incorrect language use, difficulty understanding or being able to use correct judgement

• Behaviour and personality – low mood, slowed movement and difficulty doing daily activities; difficulty socialising and changes to personality

Dementia has a complex effect on individuals. They may experience hallucinations - hearing or seeing things that other people may not be able to see. They can experience a change in personality due to their lack of memory and understanding in unfamiliar circumstances. This understandably starts to affect their independence and their mood and they become more withdrawn and less trusting as a result. The symptoms worsen over time and in the advanced stages, their ability to care for themselves and communicate effectively is completely diminished.

There are five main types of dementia;

• Alzheimer's disease is the most common, where clumps of proteins damage the healthy nerve cells in the brain

• Vascular dementia occurs from damage to the vessels that supply blood to the brain - this slows down thinking, causing a loss of focus and clarity   • Lewy Body dementia is associated with abnormal clumps of protein affecting the healthy nerve cells of the brain - typically individuals have visual hallucinations, inattention and Parkinson-type symptoms

• Frontotemporal dementia affects the cells at the front of the brain - most associated with behaviour, personality and language

• Mixed dementia, a combination of any of these

Aside from the five causes mentioned above, dementia can also be associated with other neurological conditions such as Parkinson's disease, Huntington's disease (a genetic disorder) and traumatic brain injury, as experienced in boxers or American football players in later life.

Dementia-type symptoms, that is, a decline in brain function, can be reversed where there is a treatable underlying cause. For example infections, hormonal problems related to the thyroid or low sugar levels, dehydration, an imbalance of essential salts in the blood such as sodium or calcium, vitamin or mineral deficiency such as low vitamin B12, or malnutrition as in alcoholism. Side effects of certain medications may also be to blame. In these cases, this is not a true dementia as it is a temporary state and reverses with treatment.

Your doctor will talk to you about your symptoms and how it affects your daily activity. If possible, it is always better to take someone with you who knows you well and can help with what your (or their) concerns are, or give examples of certain behaviours.

Your doctor will examine you thoroughly, arrange for you to have some blood tests and urine tests to rule out reversible causes. Your doctor will ask you to complete a memory test to understand the severity of your symptoms. 

To confirm the diagnosis of dementia, your doctor will commonly refer you to a memory clinic with a team of healthcare professionals who specialise in making a diagnosis. They may arrange further brain investigations, like a CT scan or MRI scan.