Substance-specific
Alcohol withdrawal symptoms: A complete timeline from 6 hours to 2 weeks
Alcohol withdrawal is one of the few substance withdrawals that can be fatal. Understanding the timeline helps patients and families know what to expect and when medical intervention is critical.
Hours 6-12: Early symptoms
Within 6-12 hours of the last drink, early withdrawal symptoms begin. These include anxiety, insomnia, nausea, abdominal pain, tremors (especially in the hands), increased heart rate, and elevated blood pressure. These symptoms may feel similar to a severe hangover but are physiologically distinct — they represent the nervous system rebounding from chronic alcohol suppression.
Hours 12-24: Escalation
Symptoms intensify. Tremors worsen. Some people experience alcoholic hallucinosis — visual, auditory, or tactile hallucinations (often described as feeling bugs crawling on the skin). Unlike delirium tremens, the person typically remains oriented and aware that the hallucinations are not real. Seizure risk begins in this window.
Hours 24-48: Peak danger
This is the window of highest risk for alcohol withdrawal seizures, which occur in approximately 5-10% of patients undergoing withdrawal. Seizures can be life-threatening and may progress to status epilepticus (continuous seizures) without medical intervention. This is the primary reason medical detox is recommended for anyone with a history of heavy, chronic alcohol use. Blood pressure and heart rate may reach dangerous levels.
Hours 48-72: Delirium tremens (DTs)
DTs represent the most severe form of alcohol withdrawal and occur in approximately 3-5% of patients. Symptoms include severe confusion, agitation, fever, seizures, hallucinations, and cardiovascular instability. DTs carry a mortality rate of 1-4% even with medical treatment, and up to 37% without treatment. This is a medical emergency requiring intensive care.
Days 5-14: Resolution
For most patients, acute withdrawal symptoms begin to subside after day 5. Anxiety, insomnia, and mood disturbances may persist for weeks to months (post-acute withdrawal syndrome, or PAWS). Medical supervision during this entire period ensures safety, and medications like benzodiazepines, administered on a symptom-triggered protocol, dramatically reduce the severity and danger of withdrawal.
The bottom line
If you or someone you know drinks heavily and daily, do not attempt to stop abruptly without medical supervision. Alcohol withdrawal is a medical condition that requires medical management. Contact a detox facility or emergency department.