Encyclopedia · Physiology, plainly

Dangerous withdrawal signs — the alcohol withdrawal facts that are not negotiable

Alcohol is one of the few drugs whose withdrawal can kill you. Most people do not know that. This page gives you the physiology, the timing windows, the red flags for 999, and the thresholds for when "I'll handle this at home" stops being a defensible choice.

Who is writing this

I was born in Manchester in February 1976. I am 50. I drank every day from the age of 18 — strict parents kept me out of it before that — until June 2020, when I checked into a residential treatment centre in Cheshire for four weeks. Twenty-seven years of daily drinking. I have not had a drink since. In my generation, in my work, the strange thing was not drinking — it was the absence of it. I travelled the world headhunting for tour operators and airlines; the work and the drinking ran together. I deflected the inevitable for years, looking at other business ideas, hobbies, anything that was not the real issue.

Six months after leaving residential treatment I moved to Tenerife and ran a small BnB outside Icod de los Vinos called Casa Salvia, which I sold recently. Salvia is the Spanish word for sage; we burnt it in the mornings, for the healing it is supposed to carry. The ritual I loved, the music I had never heard, the people I would never otherwise have met. Over those years I had guests in recovery stay with me, some well known, most not, and I organised sober golf events for the same crowd. None of that was clinical. It was a house, and a small business, and a community of people in early sobriety choosing places where alcohol was not the centre of the evening. I watched a lot of recovery up close that way. I watched some withdrawals up close that way. It is horrendous to watch. It only confirmed that the four weeks I spent in residential treatment were the right four weeks.

What I want to tell you on this page is what alcohol withdrawal actually does, in plain English, because softening it is how people get killed. The physiology is not negotiable. It does not care about scale, generation, or geography. I am unique. The physiology on this page is not.

A note on functioning alcoholism

Functioning alcoholism is a major issue for my generation. The drinker holds the job, runs the team, makes the meetings, attends the dinners. Nobody at work has flagged it. The marriage may have, the body may have, but nothing public has. The withdrawal physiology on this page does not care about any of that. The nervous system has been adapting to alcohol for years either way. If anything, the functioning drinker is at higher risk in unsupervised withdrawal — the daily intake is steady, the duration is long, and the social cover is what stops people seeking medical help before they stop drinking. If this paragraph describes you, or somebody you live with, the page below is for you. The functioning version is the version most likely to skip medical detox and most likely to be harmed by skipping it.

Why alcohol withdrawal is different from other withdrawals

Most people think the dangerous drugs are the illegal ones. They are wrong. Heroin withdrawal is brutal but it does not usually kill people. Cocaine withdrawal is misery but it does not usually kill people. Alcohol withdrawal can kill people. So can benzodiazepine withdrawal, for the same underlying reason.

Here is what is happening, in one paragraph, no jargon. The brain has receptors that calm it down. Alcohol works on those calming receptors. If you drink heavily and regularly for years, the brain adapts: it dials down its own calming system because the alcohol is doing the work. Now take the alcohol away. The calming system is still dialled down, but nothing is doing its job. The brain goes into uncontrolled excitation. That is what tremors are. That is what seizures are. That is what delirium tremens is. The nervous system is not "withdrawing." It is in revolt.

This is also why a heavy drinker who has been drinking every day for years should not just stop. The instinct — I'll dry out at home, I'll do it myself, I don't need help — is the instinct that puts heavy drinkers in the hospital or worse. A medically supervised detox uses medication (usually a tapered benzodiazepine) to substitute for the calming work the alcohol was doing, so the nervous system can come down slowly instead of crashing. It is not optional in heavy long-term cases. It is the standard of care.

What it looks like, hour by hour

Withdrawal does not arrive all at once. It arrives in stages, and each stage tells you something. The timings below are typical for a heavy drinker stopping abruptly. They are not promises. Some people go faster. Some skip stages. Some — and this is important — appear to be doing fine for 48 hours and then have a seizure on day three. The absence of symptoms early does not mean safety.

6 to 12 hours after the last drink — early signs. Sweating. Hand tremor. Anxiety. A racing pulse. Trouble sleeping. Nausea. Many heavy drinkers know this stage well; they call it "needing a drink." It is the start of withdrawal, not a personality.

12 to 48 hours — symptoms intensify. Tremor gets worse. Vomiting. Headache. Blood pressure climbs. Heart rate climbs. Roughly 1 in 20 alcohol-dependent people going into withdrawal will have a seizure in this window, sometimes with no other warning. This is the window where most preventable deaths happen, because people sit at home assuming it will pass.

48 to 72 hours and beyond — the dangerous window opens. This is when delirium tremens — DTs — can begin in the most affected drinkers. DTs can also start later than 72 hours in some cases. About 5% of people going through alcohol withdrawal develop DTs. Without prompt medical care, the historical mortality rate from DTs has ranged from roughly 15% to as high as one in three. With modern hospital treatment — benzodiazepine protocols, monitoring, supportive care — mortality drops below 5%. Those numbers are why this page exists.

DTs look like this: severe confusion (the person does not know where they are or who is with them), vivid hallucinations (often visual — bugs, animals, people who are not there), a fever, drenched sweat, fast irregular heartbeat, severe tremor, and agitation that may swing into terror. The person cannot tell you they are in trouble. You have to tell 999.

3 to 7 days — the tail. For people who get through without a seizure or DTs, symptoms ease over the back half of the first week. Sleep stays disturbed for longer. Mood crashes for longer. Cravings stay. The dangerous window has closed but the recovery has not started.

Seizures specifically

A withdrawal seizure usually arrives in the first 48 hours. It can arrive without much warning. The person collapses, shakes, loses consciousness, may bite their tongue, may lose bladder control. The seizure itself usually lasts under two minutes. After it, the person is exhausted and confused for an hour or more.

What you do, in order:

1. Call 999. Do this first, not last. Do not wait to see if it stops.
2. Move anything hard or sharp away from them.
3. Do not put anything in their mouth. They will not swallow their tongue. You can break their teeth.
4. When the shaking stops, turn them on their side (recovery position).
5. Stay with them until the ambulance arrives. The crew will want to know roughly how long the seizure lasted, how long the person has been drinking, and when they last had alcohol. If you know any of that, tell them.

A first withdrawal seizure raises the risk of a second one inside 24 hours. The person needs to be in a hospital, not on the sofa.

When to call what

People hesitate because they do not know which number is the right one. Use this. It will not be wrong often.

999 — for any of the red-flag list at the top of this page. Seizure, confusion, hallucinations, chest pain, racing heart, high fever with sweating, vomiting that will not stop. 999 is also for: "I do not know if this is bad enough." If you are asking the question, the answer is 999.

the hospital (emergency department) — if you cannot reach 999 quickly, or you are already in the car. the hospital sees withdrawal cases every day. They are not going to lecture you. They will treat you.

111 — for symptoms that are real but not red-flag. Tremors getting worse. Sweating. Vomiting that started hours ago. Anxiety that has tipped into panic. 111 will tell you whether to wait, see a doctor, or go to the hospital. Use them as a triage line, not a Plan A for someone clearly deteriorating.

doctor — for planning. If you are a heavy regular drinker and you want to stop, see a doctor first. They can prescribe medication for a home detox if you are a clean candidate, or refer you to a community service (Change Grow Live, Turning Point, Humankind in many areas), or to a residential detox. A doctor's appointment in advance is the difference between a safe detox and a dangerous one.

Who should not detox at home, ever

This list is short and it is firm. If any of these apply, a home detox is not appropriate, regardless of what anyone tells you.

• You drink heavily every day and have done so for years.
• You have had a withdrawal seizure before.
• You have had DTs before.
• You have a history of Wernicke's encephalopathy or Korsakoff's syndrome, or any current sign of malnutrition such as severe weight loss, significant memory problems, or unsteady walking. These signal a thiamine-deficient brain that is at much higher risk in withdrawal and needs inpatient treatment with IV thiamine.
• You are pregnant. Alcohol withdrawal in pregnancy needs inpatient management; the risks are not only to you. This is not a home detox situation under any circumstance.
• You have a history of head injury, epilepsy, heart disease, or severe liver disease.
• You are on medication that interacts badly with alcohol withdrawal — your doctor will know.
• You have tried to stop before and ended up in the hospital.
• You are alone in the house with no one to call 999 if you go down.

If you are in any of these categories, the route is doctor → community alcohol service → supervised detox (residential or, in some areas, supervised at home with daily monitoring). Not the kettle and a quiet weekend.

If you are the one watching this

You are reading this at 2am with someone next to you who is sweating through a t-shirt and shaking. You are also on this page. Most pages on the internet are written as if the drinker is the reader. Half the time, they are not. You are.

Three things, plainly.

You are not overreacting. If you are scared by what you are seeing, you are seeing it correctly. Withdrawal is horrendous to watch precisely because it is horrendous to go through. The drinker may tell you they are fine. They are not the reliable narrator at this point. You are.

The thresholds for calling 999 are on this page. Use them. If they are met, call. The ambulance crew has seen this many times this week. They are not there to judge anyone. They are there to keep someone alive.

You are allowed to insist. If the drinker is refusing to let you call, and any red-flag is present, you call anyway. This is one of the situations where being right matters more than being agreeable.

After the immediate danger has passed, the question of what happens next — detox, rehab, community service — is not your job to solve at 2am. Get through the night first. The matching question (the right clinic, the right route) is what the rest of this site is for. It can wait until daylight.

What this page is not

This page is not medical advice for your specific case. It is the publicly available physiology of alcohol withdrawal, written plainly by someone who lived through it and watched others go through it.

The decision about whether you specifically need a medically supervised detox, what medication, at what dose, in what setting — that is a clinician's decision. A doctor, an addiction specialist, an the hospital doctor. Not a website. Not a broker. Not a friend. Not me.

What this page tries to do is two things: give you enough physiology to understand why the decision matters, and give you the thresholds for when "I'll handle this at home" stops being a defensible choice.

Closing

Alcohol withdrawal is one of the few withdrawals that can kill you. Most people do not know that. Now you do. If today is dangerous, the rest of this site can wait.

If you are planning a detox and you are a heavy regular drinker: see a doctor first. Not next week. This week.

Sources

The clinical figures on this page — the seizure rate, the DT incidence, the mortality ranges — are drawn from current UK clinical guidance. The two primary documents are:

• NICE Clinical Guideline CG100 — Alcohol-use disorders: diagnosis and management of physical complications
• Royal College of Psychiatrists — Our invisible addicted population (CR231, 2025)

NHS public-facing guidance on alcohol support is at nhs.uk/live-well/alcohol-advice/alcohol-support. The Care Quality Commission's brief guide on substance withdrawal is at cqc.org.uk.

Figures vary across studies and across populations. Where this page gives a percentage, the denominator matters: "1 in 20 alcohol-dependent people in withdrawal" is not the same as "1 in 20 heavy drinkers" is not the same as "1 in 20 hospitalised cases." The point of the numbers here is to make clear the order of magnitude, not to predict any individual case. The decision about your specific situation belongs with a clinician.

This page does not link to a clinic. The whole site exists to make matching to a clinic visible. If you are at the planning stage, the rest of sober.guide is what to read next.

Written by James Roberts. Born Manchester, February 1976. Drank daily from 18 to 45. Sober since June 2020 following four weeks of residential treatment in Cheshire. International headhunter in travel and hospitality for over twenty years before sobriety. Ran Casa Salvia BnB outside Icod de los Vinos, Tenerife, 2020-2026. No commercial relationship with any UK rehab clinic. No commissions, referral fees, or paid placements on this site or any of the six-doors network. Last reviewed April 2026. Nothing here is medical advice for your specific case; it is the publicly available physiology of alcohol withdrawal, plainly written.