Acute alcohol withdrawal: a case-based approach

The case: stopping suddenly

Meet "Tom", a fictional 48-year-old who has been drinking heavily every day for several years. After a health scare he decides to stop completely, overnight, with no help. Within a day he feels shaky, sweaty and anxious, cannot sleep, and his hands tremble. He feels sick and his heart races. These are typical early symptoms of alcohol withdrawal, usually starting six to twelve hours after the last drink. Tom assumes he just needs to "push through", but this is a moment where advice matters. In people who are physically dependent on alcohol, stopping abruptly without support can trigger seizures or a severe confused state, so this is a situation to seek medical help rather than tough out alone.

Why withdrawal happens

Regular heavy drinking changes the way the brain works. Alcohol has a calming, dampening effect on the nervous system, and over time the brain adapts by becoming more excitable to keep things balanced. When the alcohol is suddenly removed, that balance is lost and the nervous system becomes over-active. This overactivity produces the shakes, sweating, fast heartbeat, anxiety and, in more severe cases, seizures and hallucinations. The more someone drinks and the longer they have been dependent, the greater the risk. This is why alcohol withdrawal is a genuine medical condition, not simply a lack of willpower, and why it sometimes needs medicines and monitoring to get through safely rather than being managed on willpower alone.

Assessment and safe treatment

When Tom contacts his GP and is assessed, the team judge how severe his withdrawal is and how high his risk is, using structured questions and sometimes a rating scale. Many people can withdraw safely in the community with support from alcohol services, while those at higher risk — for example with a history of seizures or delirium tremens, or other illness — may need admission. Treatment usually includes a medicine from the benzodiazepine family, given in a carefully reducing course to calm the overactive nervous system, alongside vitamin support, especially thiamine (vitamin B1), to protect the brain. Fluids, monitoring and treating any other problems are important too. Crucially, this is done under medical guidance, not by self-medicating, and never by simply stopping alcohol abruptly when dependence is severe.

Serious complications to know about

Two complications make alcohol withdrawal potentially dangerous. The first is withdrawal seizures, which usually happen in the first day or two after stopping and can occur without warning. The second is delirium tremens, a severe state that can develop a few days in, causing agitation, confusion, vivid hallucinations, fever, sweating and a racing heart; it is a medical emergency that can be fatal without treatment. A separate serious risk is Wernicke's encephalopathy, a thiamine-deficiency condition causing confusion, eye-movement problems and unsteadiness, which is why vitamin B1 is given. Knowing these risks explains why doctors take withdrawal seriously and why supported, planned withdrawal is far safer than stopping suddenly and unaided when someone is physically dependent on alcohol.

When alcohol withdrawal is an emergency

Alcohol withdrawal can be managed safely, but some signs mean urgent help is needed. Call 999 if someone has a seizure (fit), becomes very confused or agitated, sees or hears things that are not there, has a high fever, or cannot be roused. These may signal delirium tremens or a serious complication and need emergency treatment. Seek urgent same-day advice before or during withdrawal if a person drinks heavily every day, has had seizures or the shakes when stopping before, or has other serious illness. Never let a physically dependent person stop alcohol suddenly and alone. This article is for education only and cannot assess or treat you — if you or someone else is severely unwell, confused or fitting, call 999 straight away.