Alcohol withdrawal produces a predictable set of symptoms that range from mild anxiety and tremors to life-threatening seizures and delirium. Symptoms typically begin within 6 to 24 hours after the last drink, and for most people with mild to moderate withdrawal, they peak between 24 and 72 hours before starting to improve. The severity depends largely on how much you’ve been drinking, how long the pattern has lasted, and whether you’ve been through withdrawal before.
Why Withdrawal Happens
Alcohol enhances the activity of your brain’s main calming chemical while simultaneously suppressing its main excitatory chemical. Over time, heavy drinking forces the brain to compensate: it dials down its own calming signals and ramps up excitatory ones to maintain balance. When alcohol is suddenly removed, that artificial equilibrium collapses. The brain is left in a hyperexcitable state, with too little inhibition and too much stimulation. That imbalance is what drives every withdrawal symptom, from a racing heart to full-blown seizures.
Early Symptoms: 6 to 12 Hours
The first signs are often easy to mistake for a bad hangover. Within 6 to 12 hours after your last drink, you may notice a headache, mild anxiety, nausea, insomnia, and a general feeling of being “off.” Sweating and a slightly elevated heart rate are common. These symptoms are uncomfortable but not dangerous on their own.
Tremors, the classic shaking hands associated with withdrawal, usually begin within 5 to 10 hours of the last drink and tend to get worse over the next day or two, peaking around 24 to 48 hours.
Moderate Symptoms: 12 to 48 Hours
As withdrawal deepens, symptoms become harder to ignore. This stage can include more intense anxiety, irritability, noticeable sweating, nausea or vomiting, rapid heartbeat, and rising blood pressure. Some people develop hallucinations, typically beginning 12 to 24 hours after the last drink and lasting up to two days. These are most often auditory (hearing things that aren’t there), though visual hallucinations occur too.
An important distinction: during alcoholic hallucinosis, you generally remain aware of where you are and what’s happening around you. You may realize the hallucinations aren’t real. This is different from the confusion and disorientation that come with the more dangerous condition, delirium tremens, which appears later.
Seizures
Withdrawal seizures can occur anywhere from 6 to 48 hours after the last drink, with the highest risk falling in the 24 to 48 hour window. These are typically full-body convulsions, and it’s common for several seizures to cluster over a few hours. A history of prior withdrawal seizures significantly increases the risk of having them again. Seizures can happen even in people whose other symptoms seem relatively mild, which is one reason medical supervision matters during detox.
Delirium Tremens
Delirium tremens (DTs) is the most dangerous form of alcohol withdrawal. It commonly begins two to three days after the last drink, though it can be delayed by more than a week. Peak intensity is usually four to five days out. The hallmark is severe confusion and disorientation, combined with vivid hallucinations (more often visual than auditory), extreme agitation, drenching sweats, a dangerously fast heart rate, and high blood pressure. A resting heart rate above 100 beats per minute and systolic blood pressure above 150, especially when they don’t respond to initial treatment, are warning signs that DTs may be developing.
Only about 1% to 1.5% of people with alcohol use disorder develop DTs, so it’s relatively uncommon. But it is a medical emergency. Without treatment, roughly 15% of people who develop DTs do not survive. With proper medical care, that number drops dramatically.
How Severity Is Measured
In medical settings, withdrawal severity is tracked using a standardized scoring system that rates 10 specific symptoms: agitation, anxiety, auditory disturbances, mental clarity, headache, nausea or vomiting, sweating, tactile disturbances (such as itching, burning, or numbness), tremor, and visual disturbances. Each category is scored on a scale, and the total determines whether withdrawal is classified as mild, moderate, or severe. This score guides treatment decisions, including whether medications are needed to prevent the situation from escalating.
If you’re going through withdrawal, this is essentially what a medical team is watching for: not just the presence of symptoms, but how quickly they’re intensifying and whether they’re responding to treatment.
What Affects Your Risk
Not everyone who stops drinking heavily will experience severe withdrawal. Several factors push the needle toward a more dangerous course:
- Duration and quantity of drinking. Years of heavy daily drinking create deeper neurological adaptation than shorter periods of heavy use.
- Previous withdrawal episodes. Each round of withdrawal tends to be worse than the last, a phenomenon sometimes called “kindling.” Prior seizures or DTs are strong predictors of future severe episodes.
- Overall health. Liver disease, malnutrition, infections, and other concurrent medical problems reduce the body’s ability to handle the stress of withdrawal.
- Abrupt cessation. Stopping suddenly after prolonged heavy use is riskier than a medically supervised taper.
Symptoms That Linger for Months
Even after the acute phase resolves, many people experience a drawn-out recovery known as post-acute withdrawal syndrome, or PAWS. This is a distinct phase that can last anywhere from a few months to two years, though symptoms generally peak in the first few months and fade gradually. Common PAWS symptoms after alcohol include anxiety, depression, sleep problems, fatigue, irritability, difficulty concentrating, and cravings.
PAWS can be frustrating because it appears after you’ve already made it through the hardest physical stage. The symptoms are subtler than acute withdrawal but persistent enough to interfere with daily life and, for many people, become a significant trigger for relapse. Recognizing these lingering effects as a normal part of recovery, not a personal failing, makes them easier to manage.