Last Updated:
June 11th, 2026
Many of us are aware that if you drink enough alcohol on a night out, the chances are your memory of that night will be a little spotty the next morning. But the question of whether alcohol can cause lasting damage to the brain or even bring on conditions like Alzheimer’s disease is something that deserves a closer look.
We explore the relationship between alcohol and brain health, covering how chronic drinking damages the brain over time and what the research says about dementia risk.
What is Alzheimer’s disease?
Alzheimer’s disease is the most common form of dementia in the UK. It’s a progressive condition, meaning it gets worse over time and it affects the parts of the brain responsible for memory and thinking, including language.
The NHS describes it as a condition where symptoms develop gradually over many years and eventually become more severe. The first signs are usually minor memory problems, like forgetting recent conversations or struggling to find the right word.
Confusion and difficulty with everyday tasks become more pronounced as the condition advances.
The area of the brain affected earliest is the hippocampus, which is the region responsible for forming new memories. This is important to understand for the rest of this article, because the hippocampus is also one of the areas most vulnerable to alcohol-related damage.
How alcohol affects the brain
Drinking heavily for a long period of time damages the brain in a few different ways. It’s important to understand these ways as it helps to explain why alcohol and cognitive decline are so commonly spoken about in the same conversation.
Research has shown that acetaldehyde is toxic to brain cells, killing neurons through a process involving oxidative stress and disruption of the cell’s internal machinery.
Most of this evidence comes from laboratory and animal studies rather than direct measurement in living human brains but acetaldehyde brain damage is a well-established concept in the neuroscience literature.
This neuroinflammation worsens the brain’s ability to repair itself, as well as reducing the amount of new neurons in the hippocampus. This is important because Alzheimer’s disease attacks this same memory centre first, so damage to it can leave you vulnerable.
The damage worsens the longer the person has been drinking and the longer the dependence has been present.
One study within the review found that the brains of people with an addiction to alcohol appeared up to 11.7 years older than their actual age.
Does alcohol increase the risk of developing dementia?
The largest study to address this question analysed hospital records for around 31 million adults in France. Among those diagnosed with dementia, alcohol use disorders were the strongest modifiable risk factor.
People with alcohol use disorders were more than three times as likely to develop dementia compared to those without alcohol issues.
The link was even more worrying for early-onset dementia, which is dementia diagnosed before the age of 65. In this particular group, over half of all cases had an AUD either as the direct cause or as a contributing factor.
Other reviews found similar links, with one analysis stating that the risk of dementia increased dramatically when alcohol intake exceeded around 17.5 grams per day. This is just over two UK units.
Heavy drinking also contributes to vascular dementia through its effects on the cardiovascular system.
Additional Read – How to help an alcoholic
Understanding the different types of alcohol-related cognitive damage
Not everyone who drinks heavily will develop dementia but alcohol-related cognitive impairment exists on a spectrum. Below, we take a look at the different types of brain damage that can be caused by alcohol.
A 2024 review distinguishes this from progressive neurodegenerative conditions like Alzheimer’s, noting that alcohol-related brain damage tends to affect younger people and produces problems with executive function and memory.
A review notes that lower thiamine levels are found in 30 to 80% of chronic alcohol users.6
Without treatment, it can progress to Korsakoff’s syndrome, which consists of severe memory loss and a tendency to fill gaps in memory with fabricated information.
Around 25% of people with Korsakoff’s syndrome recover fully, roughly half show partial recovery and the remaining quarter do not recover.
How alcohol-related brain damage and Alzheimer’s can overlap
Alcohol-related brain damage and Alzheimer’s disease are different conditions with different causes but they can coexist in the same person and compound each other.
Research on Alzheimer’s patients found that a history of heavy drinking was associated with the disease being diagnosed two to three years earlier than in non-drinkers.
A 2024 review concluded that alcohol use disorders can increase the risk of dementia but do not necessarily increase the risk of Alzheimer’s disease specifically.
What this means in plain terms is that heavy drinking damages the brain in ways that look very similar to dementia and can speed up cognitive decline. But the research hasn’t been able to confirm that alcohol directly causes the specific changes in the brain that define Alzheimer’s disease.
What is clear is that heavy drinking and Alzheimer’s can both be present at the same time. When they are, the cognitive decline can be worse and progress faster than either condition would cause on its own.
How Oasis Runcorn can help
The brain can begin to recover once alcohol is removed, and in many cases, the earlier that process begins, the greater the potential for healing and improved function. If you are concerned about the effect alcohol may be having on your brain health, stopping drinking is one of the most important and protective steps you can take.
Oasis Runcorn provides alcohol detox in a residential setting, with clinical oversight to manage withdrawal safely. Thiamine replacement is a standard part of the detox process, addressing one of the key nutritional deficiencies that drives alcohol-related brain damage.
Once detox is complete, structured therapy helps you understand the patterns behind your drinking and build the foundation for long-term recovery.
If you’d like to talk through your situation, contact Oasis Runcorn today.
(Click here to see works cited)
- NHS. (2024, July 4). Alzheimer’s Disease. NHS; NHS. https://www.nhs.uk/conditions/alzheimers-disease/
- Rao, Y. L., Ganaraja, B., Murlimanju, B. V., Joy, T., Krishnamurthy, A., & Agrawal, A. (2022). Hippocampus and its involvement in Alzheimer’s disease: a review. 3 Biotech, 12(2). https://doi.org/10.1007/s13205-022-03123-4
- Cui, J., Liu, Y., Chang, X., Gou, W., Zhou, X., Liu, Z., Li, Z., Wu, Y., & Zuo, D. (2019). Acetaldehyde Induces Neurotoxicity In Vitro via Oxidative Stress- and Ca2+ Imbalance-Mediated Endoplasmic Reticulum Stress. Oxidative Medicine and Cellular Longevity, 2019, 1–13. https://doi.org/10.1155/2019/2593742
- Nutt, D., Hayes, A., Fonville, L., Zafar, R., Palmer, E. O. C., Paterson, L., & Lingford-Hughes, A. (2021). Alcohol and the brain. Nutrients, 13(11), 3938. https://doi.org/10.3390/nu13113938
- Schwarzinger, M., Pollock, B. G., Hasan, O. S. M., Dufouil, C., Rehm, J., Baillot, S., Guibert, Q., Planchet, F., & Luchini, S. (2018). Contribution of alcohol use disorders to the burden of dementia in France 2008–13: a nationwide retrospective cohort study. The Lancet Public Health, 3(3), e124–e132. https://doi.org/10.1016/s2468-2667(18)30022-7
- Zarezadeh, M., Mahmoudinezhad, M., Hossein Faghfouri, A., Mohammadzadeh Honarvar, N., Regestein, Q. R., Papatheodorou, S. I., Mekary, R. A., & Willett, W. C. (2024). Alcohol consumption in relation to cognitive dysfunction and dementia: A systematic review and dose-response meta-analysis of prospective cohort studies. Ageing Research Reviews, 102419–102419. https://doi.org/10.1016/j.arr.2024.102419
- Zahr, N. M. (2024). Alcohol Use Disorder and Dementia: A Review. Alcohol Research: Current Reviews, 44(1), 03. https://doi.org/10.35946/arcr.v44.1.03
- Day, E., Bentham, P. W., Callaghan, R., Kuruvilla, T., & George, S. (2013). Thiamine for prevention and treatment of Wernicke-Korsakoff Syndrome in people who abuse alcohol. Cochrane Database of Systematic Reviews, 7. https://doi.org/10.1002/14651858.cd004033.pub3
- Harwood, D. G., Kalechstein, A., Barker, W. W., Strauman, S., St. George-Hyslop, P., Iglesias, C., Loewenstein, D., & Duara, R. (2010). The effect of alcohol and tobacco consumption and apolipoprotein E genotype, on the age of onset in Alzheimer’s disease. International Journal of Geriatric Psychiatry, 25(5), 511–518. https://doi.org/10.1002/gps.2372