Medical references from the National Library of Medicine note that alcohol withdrawal symptoms usually begin 6–24 hours after the last drink, with mild signs such as headache, anxiety, tremor, nausea, or trouble sleeping. Symptoms often peak between 24 and 72 hours and many resolve within about 4–7 days in people with mild to moderate alcohol use.
In heavy, long‑term drinkers, more serious complications like seizures or delirium tremens tend to appear 24–72 hours after stopping and can last up to several days without treatment. Because these reactions can affect breathing, heart rate, and blood pressure, experts recommend medical supervision for anyone at higher risk during alcohol detox.