
Feeling sick after drinking alcohol is a common experience, and there are many reasons why this might be the case. Alcohol intolerance or sensitivity is a well-known cause, where the body struggles to break down alcohol and its toxins due to a deficiency of certain enzymes. This can be inherited or develop over time, with age and diet being common factors in lowering alcohol tolerance. In addition, certain medications, allergies, and health conditions can also increase sensitivity to alcohol and its side effects.
| Characteristics | Values |
|---|---|
| Alcohol intolerance | Alcoholic beverages contain ingredients that some people are allergic to, such as wheat, rye, histamine, sulfites, or grains. Alcohol intolerance is caused by a deficiency of enzymes that help the body break down alcohol. |
| Age | As people get older, their bodies become less able to process large amounts of alcohol, and it takes longer to recover from its effects. |
| Medication | Certain medications can interfere with the body's ability to process alcohol, increasing sensitivity to its side effects. |
| Food | Drinking without eating beforehand can increase the chances of feeling unwell, as food helps slow the rate of alcohol absorption. |
| Type of alcohol | Drinks with fewer congeners may lead to less severe hangover symptoms, including nausea, than drinks with more congeners. |
| Addiction | Alcohol can bring a sense of calm and relaxation, but the brain quickly adjusts to balance these effects. When the effects wear off, individuals may feel restless and anxious, leading to increased reliance on alcohol. |
| Underlying health conditions | Autoimmune disorders, gastrointestinal issues, and other chronic illnesses can alter how the body absorbs and metabolizes alcohol. |
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What You'll Learn

Alcohol intolerance
The symptoms of alcohol intolerance are the same regardless of the type of alcoholic beverage consumed. They include flushing (such as a red face), rapid heart rate, headache, low blood pressure, hives, runny nose, stomach pain, and nausea. These symptoms can vary in severity and typically appear shortly after alcohol consumption.
It is important to distinguish alcohol intolerance from an alcohol allergy, which is an immune system response to ingredients in alcoholic beverages, such as grains, chemicals, or preservatives. While alcohol intolerance is not a true allergy, allergic reactions can cause similar symptoms, including a runny nose, coughing, and stomach upset.
There is no cure for alcohol intolerance, and the only way to prevent uncomfortable reactions is to avoid alcohol or limit consumption. Lifestyle adjustments, such as staying hydrated and eating before drinking, can also help manage symptoms.
If you are experiencing any negative reactions after consuming alcohol, it is advisable to consult a healthcare professional. They can help determine whether you have an alcohol allergy, intolerance, or another underlying condition.
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Allergies to ingredients
Alcohol allergies are rare, and most people who have a reaction to alcohol are not allergic to it but rather have an intolerance. Alcohol intolerance is caused by a deficiency of enzymes that help the body break down alcohol.
However, if you are allergic to alcohol, your body reacts to it as if it's a harmful intruder and makes antibodies to fight it off. Alcohol allergies can be caused by an allergy to a grain such as corn, wheat, or rye, or to another substance in alcoholic beverages, such as sulfites, which are used to preserve wine and beer. Other potential allergens include chemicals and preservatives.
Symptoms of an alcohol allergy include rashes, itchiness, swelling, and severe stomach cramps. Allergy symptoms are often more painful and uncomfortable than alcohol intolerance symptoms. In rare cases, if untreated, an alcohol allergy can be life-threatening. Anaphylaxis caused by an alcohol allergy should be treated the same way as any other allergy: lie down right away and take a shot of adrenaline (epinephrine) if possible.
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Medication interactions
Even small amounts of alcohol can intensify medication side effects such as sleepiness, drowsiness, and light-headedness. This can interfere with your concentration and ability to operate machinery or drive a vehicle, leading to serious or even fatal accidents. Alcohol can also make a medication less effective or even useless, or it may make the medication harmful or toxic to your body.
Hundreds of commonly used prescription and over-the-counter drugs may adversely interact with alcohol. These include heart medications, which can cause rapid heartbeat and sudden changes in blood pressure; nonsteroidal anti-inflammatory drugs (NSAIDs), which can increase the risk of heart attacks, strokes, ulcers, and stomach bleeding; blood-thinning medications, which can lead to internal bleeding; and sleep medications, which can lead to impaired breathing, motor control, and unusual behavior.
Combining alcohol with certain medications, particularly those with sedative effects, can increase the risk of adverse events, including falls, driving accidents, and fatal overdoses. Older adults are at a particularly high risk for harmful alcohol-medication interactions due to age-related changes in their physiology and their increasing use of medications that could interact with alcohol. Women are also at higher risk for problems related to alcohol and medication interactions than men due to differences in body composition.
It is important to read warning labels on medications and avoid alcohol consumption if you are unsure about potential interactions. Your pharmacist or healthcare provider can help you determine which medications interact harmfully with alcohol.
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Age and tolerance
Biological, psychological, and social factors, as well as lifestyle changes, can all influence how alcohol affects an individual at different stages of their life. For example, diet, the type of alcohol consumed, past experiences with alcohol, and life events such as significant stress or relocation can all impact tolerance levels. Additionally, certain medications can increase sensitivity to the side effects of alcohol, further contributing to lower tolerance as individuals age.
The development of alcohol intolerance can also be influenced by age. Alcohol intolerance is a condition where the body struggles to break down alcohol due to a deficiency or absence of specific enzymes. This intolerance can be inherited or acquired later in life. People of East Asian descent, for instance, are more likely to inherit the genetic mutation that causes alcohol intolerance. However, anyone can develop alcohol intolerance at any point in their lives due to various factors, including changes in medication, underlying health conditions, allergies, or life events.
Ageing can also increase the risk of adverse health effects from alcohol consumption. For example, drinking alcohol can irritate the stomach lining, leading to nausea and vomiting. As individuals age, repeated exposure to alcohol can weaken and erode the stomach lining, increasing the likelihood of developing conditions such as alcoholic gastritis. Therefore, ageing not only lowers tolerance but also increases the potential for alcohol to cause harm, making it even more important for older individuals to monitor their alcohol consumption and be aware of their body's changing response to it.
In summary, age and tolerance are interconnected when it comes to alcohol. As individuals age, their bodies undergo physiological changes that reduce their ability to process and tolerate alcohol. This lowered tolerance can be influenced by various factors, including the development of alcohol intolerance, which may be inherited or acquired. Additionally, ageing increases the vulnerability of the body, particularly the stomach lining, to the harmful effects of alcohol. Therefore, it is essential for older individuals to be mindful of their alcohol consumption and to seek medical advice if they experience any adverse reactions.
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Stomach irritation
Alcohol is known to irritate the gut, including the stomach. This is because alcohol increases acid production in the stomach, which can wear away at the stomach lining, causing inflammation and pain. This condition is known as gastritis and can be caused by a single session of heavy drinking or over a longer period. It can increase the risk of developing stomach ulcers, polyps, or even tumours. The symptoms of gastritis can include a burning ache in the stomach, nausea, and vomiting. If you are experiencing indigestion that lasts a week or longer, or you are vomiting blood or have blood in your stool, you should seek medical advice.
In addition to gastritis, alcohol can also cause acid reflux, or heartburn, and increase the risk of developing stomach ulcers. Alcohol is also known to irritate the digestive system, causing nausea and vomiting. This is because alcohol is toxic, and the body tries to rid itself of it through vomiting. If you are repeatedly vomiting after drinking, this can further irritate the stomach lining, causing a buildup of acid that makes you feel more nauseated.
Some people may also develop an alcohol intolerance, which is caused by a deficiency of enzymes that help the body break down alcohol. Alcohol intolerance can be inherited and is more common among people of East Asian descent. Alcohol intolerance can cause a sudden reaction, with allergy-like symptoms such as hives, itching, facial swelling, and difficulty breathing. More severe reactions include low blood pressure, chest pain, anaphylaxis, and a closing throat, which require immediate medical attention.
If you are experiencing stomach irritation after drinking alcohol, it is important to seek medical advice and to reduce your alcohol intake. It is recommended that you follow low-risk drinking guidelines, including not drinking more than 14 units a week, having several drink-free days, and avoiding binge drinking.
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Frequently asked questions
Feeling sick after drinking alcohol can be due to alcohol intolerance or sensitivity to an ingredient in the drink. Alcohol intolerance occurs when the body lacks the enzymes to digest alcohol, which is more common among people of East Asian descent.
Alcohol intolerance symptoms can occur almost immediately, sometimes within minutes of drinking. The symptoms include nausea, vomiting, and lightheadedness.
If you have alcohol intolerance, you can manage it by avoiding or limiting alcohol consumption. You can also explore alternative alcoholic beverages or non-alcoholic options.
If you experience serious reactions after drinking alcohol, such as hives, itching, facial swelling, low blood pressure, chest pain, anaphylaxis, or throat closing up, seek immediate medical attention.











































