If you’re wondering what alcohol might be doing to your body, it’s a sensible question to ask. Some effects appear quickly. Others develop gradually over months or years. Understanding the risks isn’t about frightening yourself; it’s about having the information you need to make informed decisions.
This page explains the long-term physical health risks of alcohol, system by system: the liver, heart, brain, digestive system, cancer risk and the effects people often look for when they’re worried about themselves or someone close to them. It’s written to answer any worries, not to make it worse.
If someone has yellowing of the skin or eyes, is vomiting blood, has black stools, severe abdominal pain, chest pain, confusion, seizures or possible alcohol withdrawal, they should seek urgent medical advice through NHS 111, 999, their GP or local emergency services.
How alcohol affects the body
The body treats alcohol as a toxin. Most of it is broken down in the liver, where it’s converted into a substance called acetaldehyde that damages cells and disrupts how they repair themselves. But the effects aren’t limited to the liver. Alcohol can raise blood pressure, alter hormones and sleep, and place strain on the brain, heart, gut and immune system.
The harm is usually dose-related and cumulative. It tends to rise with the amount, the frequency, the pattern of drinking, and the number of years drinking has continued. That’s also why damage can already be well underway before anyone notices it.
The main health risks of alcohol
Liver
The liver does much of the work of processing alcohol, which is why it’s one of the organs most closely linked with alcohol harm. Alcohol-related liver disease develops through stages: fatty liver first, then in some people alcoholic hepatitis and in some cirrhosis.
Early liver damage can be silent. Someone may feel mostly fine while fat is building up or inflammation is developing. Fatty liver can often improve if drinking stops for a period of time. Mild alcoholic hepatitis can also improve with permanent abstinence, though its severe form is life-threatening. Later scarring, particularly cirrhosis, is generally not reversible, but even then, stopping drinking slows the damage and improves how long and how well someone lives.
Signs of more advanced liver damage can include tiredness, loss of appetite, nausea, swelling of the abdomen, yellowing of the skin or eyes, easy bruising, itching, dark urine or pale stools. These are worth discussing with a doctor.
Heart and circulation
Regular drinking above the low-risk guideline raises blood pressure and increases the risk of stroke and heart disease. Heavy drinking over time can weaken the heart muscle, a condition known as alcoholic cardiomyopathy, and can contribute to irregular heart rhythms. Some people notice palpitations after drinking; others have no obvious sign until something is found during a medical check.
For years, alcohol was sometimes described as being good for heart health. More recent evidence has challenged that idea, and current guidance no longer encourages people to drink for health benefits as no level of regular drinking has been shown to improve health, and the risk rises with the amount consumed. Lower-risk is not the same as risk-free.
Cancer
Alcohol is a recognised cause of cancer. Cancer Research UK sets out that drinking causes seven types: mouth, upper throat (pharynx), larynx (the voice box), oesophagus, breast, liver and bowel. The risk begins to rise even at low levels of drinking, and rises further the more someone drinks.
This isn’t limited to people who would describe themselves as dependent, and the type of drink is irrelevant: it’s the alcohol itself that carries the risk. That doesn’t mean everyone who drinks will develop cancer. It means alcohol is one of the factors that raises risk over time, and drinking less lowers it.
Brain and cognition
Alcohol affects the brain in the moment and over time. Longer-term drinking can affect memory, concentration, judgement, coordination, sleep and mood, and heavy drinking is a recognised risk factor for alcohol-related brain damage and for dementia. The risk is greater where nutrition, thiamine levels, liver function and repeated withdrawal episodes are also involved.
This page covers the physical and cognitive effects. Where the concern is anxiety, low mood, trauma or whether alcohol is being used to cope, that connection is worth understanding on its own terms, and we cover it in alcohol and mental health.
Digestive system and pancreas
Alcohol irritates the digestive system. Some people notice reflux, nausea, stomach pain, bloating or changes in appetite. Repeated irritation can contribute to gastritis and can make it harder for the body to absorb nutrients properly.
The pancreas is another important risk area. Alcohol is a recognised cause of pancreatitis, which can be sudden or long-term, and which can cause severe upper abdominal pain and serious complications. Severe pain after drinking should not be ignored. Over time, poor appetite, altered absorption and the replacement of food with alcohol can all contribute to nutritional deficiencies and physical decline.
Other effects on the body
Alcohol also affects the body in ways that feel less dramatic than liver disease or cancer but still matter day to day. It disrupts sleep quality even when it seems to help someone fall asleep. It can contribute to weight gain, both because drinks are high in calories and because drinking changes eating patterns. It affects skin and appearance through sleep, hydration and nutrition.
It can affect fertility and sexual function: in men, erection difficulties and reduced testosterone; in women, changes to menstrual cycles and fertility. It also weakens the immune system, leaving the body less able to fight off infection. These effects vary from person to person, and most improve when drinking reduces. The wider point is that alcohol rarely acts on one part of the body in isolation.
How much drinking is risky?
Alcohol risk is graded, not switched on or off at one exact number. The more someone drinks, the more often, and the longer that pattern continues, the higher the risk climbs.
In the UK, the Chief Medical Officers’ low-risk guideline is to drink no more than fourteen units a week, spread over three or more days, with some drink-free days. The NHS describes this as low-risk rather than safe, because there is no completely safe level of drinking. It is the same guideline for men and women.
This page is not a units calculator. The more useful question is not only whether you are above fourteen units, but whether drinking has become regular, hard to change, physically noticeable, or difficult for someone at home to ignore.
Can the damage be reversed?
Some of it, yes. Early alcohol-related fatty liver often improves after a period without drinking. Sleep, skin, blood pressure and immune function tend to recover as drinking reduces.
Other harm is longer-lasting, particularly long-term scarring, nerve damage, advanced liver disease, cancer or lasting brain injury. Even then, stopping still matters. It can slow further damage, lower future risk, improve general health, and make medical treatment safer and more effective.
This is the part that is easy to misread. Finding out there may be harm does not mean there is no point now. The body can recover in real ways, and risk can change from this point forward. Understanding what alcohol is doing to the body is one question. Whether the drinking itself has become hard to control is another, and often the more useful one to sit with next. If that is the question underneath this one, it is worth reading about alcohol addiction and what tends to come next.
Early signs of alcohol-related harm
Alcohol-related harm can be hard to spot early, because many of the signs are vague and overlap with stress, poor sleep, diet, medication, menopause, infection or anxiety. Possible warning signs include:
- feeling tired, weak or generally unwell more often
- digestive changes: nausea, reflux, diarrhoea or stomach pain
- poor sleep, waking in the night, or not feeling rested
- changes in weight, appetite or nutrition
- raised blood pressure or palpitations
- yellowing of the skin or eyes
- easy bruising, itching, or swelling in the legs or abdomen
- problems with memory, concentration or balance
- tingling, numbness or burning pain in the feet or hands
- repeated infections, or being slower to recover from illness
These signs do not prove alcohol is the cause. They do mean it is sensible to speak to a GP, especially if drinking has been regular, heavy, increasing, or hard to reduce. If the main worry is not a symptom but the pattern of drinking itself, our main alcohol addiction page may be a better place to continue.
Sources
The clinical information on this page is drawn from UK health authorities, with clinical-reference sources used where they add precision:
- NHS — The risks of drinking too much
- NHS — Alcohol-related liver disease
- NHS — Alcohol units
- UK Chief Medical Officers’ Low Risk Drinking Guidelines
- NICE — Alcohol-use disorders: diagnosis and management of physical complications (CG100)
- Cancer Research UK — Alcohol and cancer
- British Heart Foundation — Alcohol and your heart
- StatPearls — Alcohol-Associated Liver Disease (liver staging)
- StatPearls — Alcoholic Neuropathy (nerve-symptom detail)