Alcohol withdrawal symptoms typically start within 6 to 12 hours after your last drink, beginning with mild signs like headache, anxiety, and trouble sleeping. The timeline varies depending on how heavily and how long you’ve been drinking, but the first symptoms rarely take longer than 12 hours to appear. From there, withdrawal follows a fairly predictable pattern over the next several days, with symptoms peaking and then gradually improving.
The First 6 to 12 Hours
The earliest withdrawal symptoms are often easy to mistake for a bad hangover. Within 6 to 12 hours of your last drink, you may notice a headache, mild anxiety, nausea, insomnia, and general irritability. Tremors, or “the shakes,” typically begin within 5 to 10 hours and are one of the most recognizable early signs. These tremors tend to peak between 24 and 48 hours after your last drink.
What’s happening in your brain during this window is a rebound effect. Alcohol suppresses your nervous system’s excitatory signals and amplifies its calming signals. With chronic drinking, your brain adjusts by cranking up the excitatory activity and dialing down the calming activity to compensate. When alcohol is suddenly removed, that compensated state is left unchecked. Your nervous system is essentially running hot with no brake pedal, which produces the agitation, tremors, sweating, and rapid heartbeat that define early withdrawal.
12 to 48 Hours: The Peak Risk Window
This is the period when withdrawal can escalate from uncomfortable to dangerous. Hallucinations, when they occur, usually begin within 12 to 24 hours after the last drink and can last up to two days. These can be visual, auditory, or tactile, meaning you might see, hear, or feel things that aren’t there.
Seizures are the most serious risk during this window. They can occur as early as 6 hours after the last drink, but most happen between 12 and 48 hours, with the highest risk at around 24 hours. About 95% of withdrawal seizures occur within 7 to 38 hours of stopping. These are typically generalized seizures affecting the whole body and are more common in people who have gone through withdrawal before.
Not everyone who withdraws from alcohol will experience hallucinations or seizures. These complications are more likely in people with a long history of heavy drinking or previous episodes of complicated withdrawal. But because the timeline can move quickly, this window is the reason medical supervision matters.
48 to 72 Hours: When Delirium Tremens Can Appear
Delirium tremens, often called DTs, is the most severe form of alcohol withdrawal. It commonly begins two to three days after the last drink, though it can sometimes be delayed by more than a week. Its peak intensity is usually four to five days after the last drink.
DTs involve sudden, severe confusion, high fever, heavy sweating, a rapid or irregular heartbeat, and hallucinations. It’s a medical emergency. Even with intensive hospital care, the mortality rate ranges from 5 to 15%. Symptoms that signal this level of severity include sudden and extreme confusion, chest pain, seizures occurring alongside a high fever, or a heartbeat that feels erratic rather than just fast.
DTs don’t happen to everyone going through withdrawal. They’re most likely in people who have been drinking very heavily for years, who have had DTs before, or who have other medical conditions complicating the picture.
After the First Week: Lingering Symptoms
Most acute withdrawal symptoms resolve within five to seven days. But for some people, a second phase follows. This is sometimes called post-acute withdrawal syndrome, and it involves psychological and mood-related symptoms that can persist for months or, in some cases, longer. Common symptoms include anxiety, irritability, difficulty concentrating, sleep problems, and mood swings.
These lingering symptoms tend to fluctuate. You might feel fine for a stretch, then have a rough few days. This unpredictability is one of the reasons post-acute withdrawal is a major contributor to relapse. It helps to know it’s a recognized part of the process rather than a sign that something new is wrong.
What Affects How Quickly Symptoms Start
Several factors influence both the onset and severity of withdrawal. The most significant are how much you drink daily, how many years you’ve been drinking heavily, and whether you’ve gone through withdrawal before. Each episode of withdrawal can actually make the next one worse, a phenomenon called kindling, where the brain becomes increasingly sensitive to the rebound excitation that drives symptoms.
Your overall health matters too. Liver function, nutritional status, age, and whether you have other medical conditions all affect how your body handles the sudden absence of alcohol. Someone who drinks a bottle of wine nightly for a year will generally have a milder and slower onset than someone who has been drinking a fifth of liquor daily for a decade.
How Severity Is Measured
In medical settings, withdrawal severity is tracked using a standardized scoring system that rates 10 symptoms, including tremor, anxiety, sweating, nausea, agitation, and sensory disturbances. Scores below 8 to 10 indicate mild withdrawal that often doesn’t require medication. Scores of 8 to 15 suggest moderate withdrawal with noticeable physical signs like a racing heart and heavy sweating. Scores above 15 indicate severe withdrawal with a risk of progressing to delirium tremens.
This scoring is done repeatedly over the first few days because withdrawal isn’t static. Someone who starts mild can escalate, which is why the first 72 hours are the most closely watched period. If you’ve been drinking heavily and are considering stopping, the speed and unpredictability of this timeline is the reason abrupt cessation without medical guidance carries real risk.