What is alcohol withdrawal syndrome (AWS)?


  1. Alcohol withdrawal syndrome (AWS) is the name for the symptoms that occur when a heavy drinker suddenly stops or significantly reduces their alcohol intake.
  2. The symptoms of AWS may appear anywhere from six hours to a few days after your last drink.
  3. The most severe type of withdrawal syndrome is known as delirium tremens, which includes symptoms such as hallucinations, fever, and seizures.

Alcohol withdrawal syndrome (AWS) is the name for the symptoms that occur when a heavy drinker suddenly stops or significantly reduces their alcohol intake. With AWS, you may experience a combination of physical and emotional symptoms, from mild anxiety and fatigue to nausea. Some symptoms of AWS are as severe as hallucinations and seizures. At its most extreme, AWS can be life-threatening.

What are the symptoms of alcohol withdrawal syndrome?


The signs and symptoms of AWS may appear anywhere from six hours to a few days after your last drink. These usually include at least two of the following:

  • tremors
  • anxiety
  • nausea
  • vomiting
  • headache
  • an increased heart rate
  • sweating
  • irritability
  • confusion
  • insomnia
  • nightmares
  • high blood pressure

The symptoms may worsen over two to three days and persist for weeks. They may be more noticeable when you wake up with less alcohol in your blood.

The most severe type of withdrawal syndrome is known as delirium tremens (DT). Its signs and symptoms include:

  • extreme confusion
  • extreme agitation
  • a fever
  • seizures
  • tactile hallucinations, such as having a sense of itching, burning, or numbness that isn’t actually occurring
  • auditory hallucinations, or hearing sounds that don’t exist
  • visual hallucinations, or seeing images that don’t exist

If you have severe AWS symptoms, it’s a medical emergency. Call for help or go to the emergency room. A high fever, hallucinations, and heart disturbances are all reasons to seek immediate help.

What causes alcohol withdrawal syndrome?


Excessive drinking excites and irritates the nervous system. If you drink daily, your body becomes dependent on alcohol over time. When this happens, your central nervous system can no longer adapt easily to the lack of alcohol. If you suddenly stop drinking or significantly reduce the amount of alcohol you drink, it can cause AWS.

Who is at risk for alcohol withdrawal syndrome?

Risk Factors

People who are addicted to alcohol or who drink heavily on a regular basis and cannot gradually cut down are at high risk for AWS. AWS is more common in adults, but children and teenagers who drink excessively may also experience the symptoms. You’re also at risk for AWS if you’ve previously had withdrawal symptoms or needed medical detox for a drinking problem.

The Centers for Disease Control and Prevention define heavy drinking as more than eight drinks per week for women and more than 15 drinks per week for men. The following are the equivalent of one drink:

  • 1.5 ounces of distilled spirits or liquor, including gin, rum, vodka, and whiskey
  • 5 ounces of wine
  • 8 ounces of malt liquor
  • 12 ounces of beer

Binge drinking is the most common form of heavy drinking. For women, it is defined as four or more drinks in one sitting. For men, it is defined as five or more drinks in one sitting.

How is alcohol withdrawal syndrome diagnosed?


Your doctor will review your medical history, ask about your symptoms, and conduct a physical exam. Some signs your doctor will look for include:

  • hand tremors
  • an irregular heart rate
  • dehydration
  • a fever

Your doctor may also perform a toxicology screen. This tests how much alcohol is in your body.

The Clinical Institute withdrawal assessment of alcohol (CIWA-Ar) is a series of questions used to measure AWS. Your doctor may use this test to diagnose AWS. It can also be used to determine the severity of your symptoms. The scale measures the following 10 symptoms:

  • agitation
  • anxiety
  • auditory disturbances
  • clouding of sensorium, or the inability to think clearly
  • headache
  • nausea/vomiting
  • paroxysmal sweats, or sudden, uncontrollable sweating
  • tactile disturbances
  • tremor
  • visual disturbances

Questions your doctor may ask include:

  • Who am I?
  • What day is this?
  • Does it feel like there is a band around your head?
  • Do you feel sick to your stomach?
  • Do you feel bugs crawling under your skin?

How is alcohol withdrawal syndrome treated?


Treatment for AWS depends on how severe your symptoms are. Some people can be treated at home, but others may need supervised care in a hospital setting to avoid potentially dangerous complications such as seizures.

The first goal of treatment is to keep you comfortable by managing your symptoms. Alcohol counseling is another important treatment goal. Your doctor will want you to stop drinking as quickly and safely as possible.

Home care

Mild symptoms of AWS can often be treated at home. A relative or friend must stay with you to monitor your condition. Their job is to make sure that if you develop any worsening of symptoms, they get you to a hospital or call 911 immediately. They should also help you to get to your counseling appointments and visit the doctor regularly for any routine blood tests that may be ordered. You may also need tests for alcohol-related medical problems.

If your home environment isn’t helpful for staying sober, talk to your doctor. Your doctor may be able to connect you with shelter programs for people recovering from alcohol addiction.


If your symptoms are more severe, you may need to stay in the hospital. This is so your doctor can monitor your condition and manage any complications. You may need to get fluids through your veins to prevent dehydration and medications to help ease your symptoms.


Symptoms of AWS are often treated with sedatives called benzodiazepines. Commonly prescribed benzodiazepines include:

In addition, vitamin supplements may be given to replace essential vitamins that are depleted by alcohol use. Once withdrawal is complete, additional medications and supplements may be needed to address complications and nutritional deficiencies that occur as a result of chronic alcohol use. 

Learn more about benzodiazepines »

Outlook for alcohol withdrawal syndrome


Most people with AWS fully recover. If you stop drinking, get treatment, and are otherwise healthy, the outlook is usually good. However, sleep disturbances, irritability, and fatigue may continue for months.

If AWS has advanced to delirium tremens, it can be fatal. If you begin experiencing severe symptoms of AWS, it’s important to seek immediate medical attention. The sooner you begin treatment, the better your chances are of avoiding life-threatening complications. 

Preventing alcohol withdrawal syndrome


The best way to prevent AWS is to avoid regular heavy drinking. If you’re already dependent on alcohol, seek counseling and medical care. The goal is to safely and gradually decrease your dependence on alcohol so that you can resume a healthy life.

You asked, we answered

  • What nutrition advice can you provide for people recovering from alcohol addiction?
  • This depends on the individual and the results of laboratory tests that their physician may order. In general, blood work will test serum magnesium, and replacements will occur if indicated. In general, vitamins such as thiamine and folic acid will need to be supplemented. In addition, the physician may add a daily multiple vitamin. The person should also try to eat three well-balanced meals per day and drink enough water to remain hydrated.

    - Timothy J. Legg, PhD, CARN-AP, CASAC, MAC