Alcohol poisoning causes a distinct set of warning signs that center on slowed breathing, loss of consciousness, vomiting, and dangerously low body temperature. It happens when so much alcohol enters the bloodstream that the parts of the brain controlling basic life-support functions, including breathing, heart rate, and temperature regulation, begin to shut down. Recognizing these symptoms quickly is critical because the condition can turn fatal within hours or even minutes.
The Key Symptoms to Watch For
Alcohol poisoning produces a cluster of physical signs that are different from simply being “very drunk.” The major symptoms include:
- Slow or irregular breathing. Fewer than eight breaths per minute, or gaps of more than 10 seconds between breaths, signals the brain is losing its ability to keep the lungs working.
- Vomiting, especially while semiconscious or unconscious.
- Seizures.
- Irregular heartbeat, which in severe cases can progress to the heart stopping entirely.
- Extremely low body temperature, with skin that feels cold and clammy.
- Bluish or pale skin, particularly around the lips and fingertips, indicating the body isn’t getting enough oxygen.
- Stupor or unconsciousness. The person cannot be woken up or responds only briefly to painful stimulation like pinching.
Not every symptom has to be present. Even one or two of these signs, particularly slow breathing or an inability to wake the person, point to a medical emergency.
Why Symptoms Can Worsen After Drinking Stops
One of the most dangerous aspects of alcohol poisoning is that it can keep getting worse even after someone has stopped drinking. Alcohol sitting in the stomach and small intestine continues to absorb into the bloodstream for 30 to 90 minutes after the last drink. That means a person who seems only moderately intoxicated at midnight could be in serious danger by 1 a.m., even if they haven’t touched another glass. Blood alcohol concentration can rise to 0.30% to 0.40%, the range where loss of consciousness and life-threatening poisoning typically occur. Above 0.40%, the risk of coma and death from respiratory arrest becomes acute.
This delayed absorption is why “sleeping it off” can be a fatal decision. Someone who passes out after heavy drinking may look like they’re simply asleep, but their blood alcohol is still climbing.
How Alcohol Poisoning Becomes Life-Threatening
The immediate danger comes from two directions: the brain’s inability to keep breathing going and the risk of choking on vomit.
Alcohol suppresses the gag reflex. In a sober person, vomiting triggers an automatic cough that keeps the airway clear. When someone is heavily intoxicated and semiconscious, that reflex fails. Vomit can be inhaled into the lungs, blocking the airway or causing aspiration pneumonia, a serious lung infection. People who are intoxicated by alcohol are specifically identified as high-risk for this complication.
At the same time, the brainstem, which runs breathing on autopilot, slows down. Breathing can become so shallow and infrequent that the body simply doesn’t take in enough oxygen. The heart rhythm can destabilize. Body temperature drops because the brain’s temperature-control center is impaired, and alcohol dilates blood vessels near the skin, letting heat escape faster. In cold environments, hypothermia compounds every other risk.
What to Do While Waiting for Help
If someone shows any combination of these symptoms, call emergency services immediately. While waiting, two actions matter most. First, if the person has passed out, roll them onto their side into what’s called the recovery position. This keeps the airway open and allows vomit to drain out of the mouth rather than back into the throat. Second, stay with them and monitor their breathing. There is a real risk they could choke on their own vomit or simply stop breathing.
Do not leave an unconscious person alone to “sleep it off.” Do not try to make them vomit, give them coffee, or walk them around. None of these actions reduce blood alcohol levels, and forcing vomit in someone with a suppressed gag reflex increases the choking risk.
Who Is Most at Risk
Alcohol poisoning can happen to anyone who drinks too much too quickly, but certain situations raise the odds. Binge drinking, typically defined as consuming a large amount within a short window, is the primary driver. Body weight, whether the person has eaten, how fast they drank, and individual tolerance all influence how quickly blood alcohol reaches dangerous levels. Mixing alcohol with other sedating substances makes respiratory depression worse at lower amounts of alcohol.
Deaths from excessive alcohol use have been rising sharply. CDC data shows the average annual number of alcohol-attributable deaths in the U.S. climbed roughly 29% between 2016 and 2021, reaching over 178,000 per year. Fully alcohol-attributable causes, the category that includes alcohol poisoning, accounted for about 51,600 of those deaths during 2020 to 2021, a 46% increase from just a few years earlier. The increase was especially steep among women, where alcohol-related deaths rose approximately 35% compared to 27% among men.
How to Tell It Apart From Being Very Drunk
The line between severe intoxication and alcohol poisoning can be hard to spot, but a few differences stand out. A very drunk person may be slurring, stumbling, and making poor decisions, but they respond when you talk to them, their breathing is normal, and their skin color looks healthy. A person with alcohol poisoning either can’t be woken up at all, responds only to pain, or drifts in and out of consciousness. Their breathing is visibly slow or irregular. Their skin may look bluish or feel cold and damp.
When in doubt, treat it as an emergency. Alcohol poisoning does not improve on its own over a short period, and the window between “worrying” and “critical” can be narrow.