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Hangover Risk

Last updated Methodology & primary sources

Hangover Risk estimates factors that may worsen next-day symptoms after alcohol. It is educational only, not a diagnosis, treatment plan, or guarantee of how you will feel.

Symptom-risk profile

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Alcohol pattern

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Educational use

How to use this result

This page shows educational context for next-day symptom risk. It does not diagnose a hangover, treat alcohol poisoning, guarantee how you will feel, or provide a driving/legal-safety answer.

What it estimates

Symptom-risk factors

The profile weighs alcohol amount, congener load, sleep, hydration context, and food timing. These are contributors, not a personal medical prediction.

May help comfort

Rest, food and fluids

Water, labelled electrolytes if tolerated, food, and sleep may support comfort. They do not lower BAC, reverse impairment, or treat severe symptoms.

Do not rely on

Alcohol, stimulants or “detox” fixes

More alcohol, coffee, cold showers, IV drips, detox products, or supplements should not be treated as protection from alcohol-related harm.

Warning signs: do not treat this as a hangover

Seek urgent medical help for confusion, repeated vomiting, slow or irregular breathing, seizures, chest pain, fainting, blue or clammy skin, suspected head injury, or if someone cannot be woken.

Five factors that can worsen next-day symptoms

Next-day symptom risk is not governed by a single variable. Controlled research describes several interacting factors that can contribute to next-morning symptoms. Alcometer presents them as educational context; individual experience varies.

The first factor is total ethanol exposure. Higher total intake generally increases the chance of next-day symptoms. The second factor is congener load: fermentation and ageing byproducts that accompany ethanol in some drinks. The third factor is hydration context, because alcohol can increase fluid loss and worsen thirst or headache for some people.

The fourth factor is sleep disruption. Alcohol can make falling asleep easier while fragmenting sleep later in the night. The fifth factor is food context: eating before or during drinking may slow absorption and reduce stomach irritation for some people. The calculator assigns weighted contributions so you can see which factors drive the educational profile, not to predict exactly how you will feel.

Dark vs. clear drinks: congener context

Congeners are fermentation and ageing byproducts found alongside ethanol in alcoholic drinks. The major families include methanol, acetone, acetaldehyde, tannins, and fusel oils. Controlled studies have reported higher next-day symptom ratings with some higher-congener drinks at matched ethanol doses.

The approximate congener content across common drinks is shown below. These values are rough order-of-magnitude figures drawn from fermentation chemistry surveys; brand-level variation within a category can be significant.

DrinkCongener content (approx. ppm)
Bourbon~6,000
Brandy / Cognac~4,000
Dark rum~3,000
Red wine~1,000
White wine~300
Gin~150
Vodka~100

The general pattern is that dark, barrel-aged spirits may carry more congeners than filtered clear spirits. Congeners are one contributor only. Total alcohol exposure, sleep, food, hydration, medication, and health context can matter more for an individual person.

Why hair of the dog does not work

Drinking more alcohol the morning after can briefly mask symptoms, but it adds more alcohol that must still be metabolized.

This page does not recommend hair of the dog, supplements, or product cures. It frames next-day symptoms as educational risk factors, not as a condition to self-treat with alcohol.

The National Institute on Alcohol Abuse and Alcoholism (NIAAA) states that there is no proven hangover cure. Time remains the main factor. Fluids, food, labelled electrolytes if tolerated, and rest may support comfort, but they do not reverse impairment, treat alcohol poisoning, or guarantee how you will feel.

Anxiety, mood and the broken night

Some people notice anxiety, low mood, irritability, or unease the day after drinking. This is not a character flaw. Alcohol can affect GABA, glutamate, stress hormones, sleep quality, and inflammation, all of which may influence how someone feels the next day.

The timing varies. For some people, anxious or unsettled feelings are strongest after alcohol levels have fallen and sleep has been fragmented. Dose, sleep loss, baseline anxiety, medications, and individual metabolism all change the experience.

Sleep quality is a major reason next-day symptoms can feel worse. Alcohol may shorten the time it takes to fall asleep while disrupting REM sleep and causing early waking or fragmented rest later in the night. This section is educational; it does not diagnose anxiety, sleep disorders, or any medical condition.

Genetics and individual variation

People respond to alcohol differently. Genetics, body size, sex, medication, sleep, food, tolerance, health conditions, and drinking pattern can all change how someone feels the next day.

Two well-studied genes are ADH1B and ALDH2, which influence how alcohol and acetaldehyde are metabolized. Some ALDH2 variants are associated with flushing, headache, nausea, and rapid discomfort after drinking. These patterns are common in several East Asian populations but can occur elsewhere too.

This page does not test genetics and cannot tell you why a specific person feels a certain way. It only shows a structured educational profile based on the inputs you choose.

Frequently Asked Questions

What causes hangovers — is it just dehydration?

Dehydration can contribute, but it is not the whole story. Alcohol metabolism, sleep disruption, congeners, food context, fluid loss, medication, and individual biology can all affect next-day symptoms. The model is a structured educational profile, not a diagnosis.

Do clear spirits really cause milder hangovers?

At matched ethanol doses, controlled studies by Rohsenow and Howland (2010) found higher next-day symptom ratings with bourbon than vodka. Congener content may contribute, but total alcohol still matters most and individual experience varies.

Why do I get hangxiety but my friend does not?

Alcohol can affect neurotransmitters, stress hormones, sleep quality, and inflammation. Those changes may contribute to next-day anxiety or low mood for some people. Baseline anxiety, medication, sleep loss, dose, and individual metabolism all matter, so this tool cannot predict who will feel anxious.

Does eating before drinking prevent hangovers?

Eating may reduce next-day symptom risk for some people and may slow absorption. It does not remove alcohol, prevent intoxication, reverse impairment, or guarantee how you will feel.

How long does a hangover typically last?

Many hangover symptoms improve within 24 hours, but duration varies by person, dose, sleep, medication, hydration, and health context. If symptoms persist beyond 72 hours, or include chest pain, confusion, or repeated vomiting, seek medical evaluation rather than assuming a long hangover.

Does hair of the dog actually help?

It may mask symptoms temporarily, but it does not cure anything and adds more alcohol that must still be metabolized. The NIAAA and peer-reviewed hangover reviews reject hair of the dog as a remedy. Time remains the main factor; fluids, food, and rest may support comfort.

Is there a proven hangover cure?

No proven universal hangover cure exists. Time remains the main factor. Water, labelled electrolyte products if tolerated, food, and rest may support comfort, but they do not reverse impairment or treat alcohol poisoning. Be careful with medicines after alcohol and seek qualified medical advice if symptoms are severe or unusual.

Why do I sleep badly after drinking even if I fall asleep fast?

Alcohol can make falling asleep easier while disrupting sleep later in the night. Studies report changes in REM sleep and sleep continuity after alcohol. That can leave some people waking early, dreaming vividly, or feeling unrested even after enough time in bed.

References: Rohsenow & Howland (2010). Alcoholism: Clinical and Experimental Research. Wiese et al. (2000). Annals of Internal Medicine. Ebrahim et al. (2013). Alcoholism: Clinical and Experimental Research. Hobson & Maughan (2010). Alcohol and Alcoholism. Jones & Jonsson (1994). Journal of Forensic Sciences.