Health effects of alcohol

Alcohol, also known as ethanol, can affect health. When people drink, they might feel dizzy and have trouble thinking clearly. Drinking can also cause dehydration, which means losing water from the body. Over time, alcohol can change how the liver and brain work. It can increase the chance of getting some kinds of cancer. It can also lead to a problem called alcohol use disorder, where a person feels they can’t stop drinking.

For teenagers, drinking alcohol is especially dangerous because their brains are still developing. Teens who drink have a higher chance of getting hurt.

Some research suggests that small amounts of alcohol might help protect the heart for adults over 40 years old. But even a little bit of alcohol can increase the risk of cancer.

The World Health Organization has found that harmful drinking causes many deaths around the world each year. Some countries put warning labels on alcohol packages to tell people about these risks. In 2025, the surgeon general of the United States said that drinking alcohol can cause several types of cancer and suggested adding cancer warning labels to alcohol drinks in the U.S.

Short-term effects

Main article: Short-term effects of alcohol consumption

When people drink alcohol, they might feel more relaxed at first. But drinking a lot can make them very sleepy or unable to think clearly. Doctors can check how much alcohol is in a person's blood to see how much they have had to drink.

Alcohol can also make it hard to sleep well and can make the body lose water. Drinking a lot on an empty stomach can be very bad for the body. Even if someone can drink a lot without passing out, it is still not good for their health.

Long-term effects

Main article: Long-term effects of alcohol

Drinking alcohol for a long time can hurt the body. It can damage the liver, brain, and other parts. It also makes it more likely to get some kinds of cancer, like in the mouth, liver, and breast.

Heavy drinking can cause serious health problems. It can hurt the nerves and the pancreas. It can also lead to malnutrition and make it hard for the body to stay healthy. Young people’s brains are especially affected by alcohol.

Pregnancy and breastfeeding

Doctors tell women not to drink alcohol when they are pregnant. Alcohol can move from a mother’s blood to the baby’s blood through the placenta. This can hurt the baby’s brain and how its body grows. Even a little alcohol can cause problems. There is no safe amount to drink when pregnant.

Babies who are around alcohol before they are born may develop fetal alcohol spectrum disorders. This can cause issues such as unusual faces, low birth weight, stunted growth, small head size, delays in motor skills, hearing or vision problems, learning disabilities, behavior problems, and trouble with social skills. These children may have a harder time in school and later in life.

For mothers who are breastfeeding, some health rules say that small amounts of alcohol once in a while may be okay. But it is best to wait a few hours before breastfeeding or to express milk before drinking.

Cardiovascular disease

Main article: Alcohol and cardiovascular disease

Some studies have looked at how drinking alcohol affects heart health. In 2010, one review said that drinking a small amount of alcohol might not hurt people who already have heart problems. But the researchers did not say that people should start drinking to stay healthy. A later study in 2018 found that drinking more alcohol, even in small amounts, can increase the chances of certain heart issues like stroke or problems with the heart’s blood vessels and heart failure. Health experts advise people who don’t drink to avoid starting.

Insulin response

Alcohol can make the body make more of a substance called insulin. Insulin helps the body turn food into fat and stops the body from burning fat. The liver changes alcohol into a special kind of energy called acetyl CoA. If someone drinks too much alcohol for a long time, fat can build up in the liver. This can cause problems like inflammation and alcoholic liver disease.

People with diabetes should be careful when drinking alcohol. Alcohol can stop the body from making new sugar, which might make blood sugar get too low for people taking certain medicines. Also, alcoholic drinks do not make people feel as full as other foods with the same number of calories.

Mental health

Drinking too much alcohol can sometimes happen when a person has mental health problems. Many people with mental health issues may find themselves drinking in ways that can be harmful.

Alcohol education

Main article: Alcohol education

Alcohol education teaches people about how drinking alcohol can affect their health and their families. It started in schools in the late 1800s, led by groups like the Woman's Christian Temperance Union. At first, it focused on how drinking affected families and society. Later, in the 1930s, it also began to explain how alcohol can harm health. Today, groups like the National Institute on Alcohol Abuse and Alcoholism work to share this important information.

Alcohol expectations

Alcohol expectations are ideas and feelings people have about what might happen when they drink alcohol. These ideas can influence why someone chooses to drink or decide not to. For example, some believe drinking makes them more relaxed or friendly, while others think it might lead to risky behavior.

Studies show that what people expect can affect how they act. In one test, men acted more aggressively when they thought they were drinking alcohol, even if they were just drinking tonic water. This shows that expectations can play a big role in behavior, just like a placebo effect. Different cultures have different expectations about alcohol, which can change how people behave when they drink.

Alcohol use disorder

See also: Alcohol abuse and Substance abuse prevention

Many people around the world drink too much alcohol. This can cause problems for their health.

Alcohol misuse prevention programs of the World Health Organization

Drinking too much alcohol can cause health problems. It can affect health during pregnancy, lead to diseases, and cause injuries. It can also impact mental health and make other illnesses worse. The United Nations wants to improve health for everyone. In 2018, the World Health Organization started a program called “SAFER” to help reduce the harm from alcohol. SAFER focuses on steps to prevent alcohol misuse, such as making alcohol less easy to get and stopping people from drinking and driving.

Recommended maximum intake

Main article: Alcohol consumption recommendations

In the United Kingdom, drinking too much alcohol at one time has been a concern. Health officials advise that drinking more than 14 units of alcohol a week can harm your health. For many years, the UK government suggested limits on daily drinking to prevent binge drinking.

Sobriety

Further information: Sobriety

Sobriety means not feeling the effects of substances that change how you think or feel. Being sober is the natural state for humans from birth. In treatment programs, sobriety is the goal of not using or craving these substances any more. Different groups may have their own meanings for sobriety. For some, it also means finding a better balance in life.

Injury and deaths

Drinking alcohol can make it harder to move, see, and react quickly. This can lead to injuries such as falls, head injuries, and car accidents. People who have been drinking are more likely to have serious injuries.

Alcohol use can also cause many health problems and deaths around the world. In the United States, many people died because of alcohol in 2010. The World Health Organization reported that millions of people died from the harmful effects of alcohol in 2016. Many of these deaths were among younger adults.

Flaming drink

Main article: Flaming drink

A flaming drink is sometimes lit on fire for fun, but this can be very dangerous. Some bars have had to close because they did not follow safety rules. Bartenders have been badly burned by these drinks.

Genetic differences

Some people have genetic differences that affect how their bodies react to alcohol. For example, people of Asian descent often have a reaction where their face turns red after drinking alcohol. This happens because their bodies cannot process alcohol as well, leading to a buildup of a substance called acetaldehyde. This same reaction can also cause breathing problems like a runny nose or asthma in some people.

Native American populations often face greater challenges with alcohol-related health issues. Research suggests this may be due to a mix of genetic factors and learned behaviors, as well as other influences like low self-esteem. Scientists are still studying why these differences exist and how they affect health.

Gender differences

Historically, men have often drunk more alcohol than women. But now, the difference is getting smaller, especially among young women.

Women can be more affected by alcohol than men for a few reasons. Women usually have more body fat, which can keep alcohol in their bodies longer. They also have lower levels of enzymes that help break down alcohol, so more alcohol stays in their blood. Changes in hormones during a woman's monthly cycle can also affect how her body processes alcohol. These factors can make women more sensitive to alcohol.

Benefits of quitting alcohol

When people stop drinking alcohol, their health can get better in many ways. The body can start to heal, which helps both the body and mind. Stopping alcohol can improve sleep, help the liver get better, and lower the chance of some diseases.

Quitting alcohol can also help the mind. People often think more clearly, focus better, and feel steadier moods after they stop drinking. Overall, stopping alcohol can lead to a healthier and happier life.

Main article: long-term effects of alcohol consumption