Delirium tremens (DT) is a severe form of alcohol withdrawal and involves sudden and severe mental or nervous system changes. DT is a dangerous complication of alcohol withdrawal and can be life-threatening. Delirium tremens typically occur when you stop drinking alcohol after a period of heavy drinking, especially if you don’t eat enough food during that time. It’s most commonly associated with people who have a history of attempting alcohol withdrawal. It may also be caused by a head injury, infection, or illness in people with a history of alcohol abuse. Delirium tremens symptoms can occur as early as 48 hours after your last drink and can last up to 5 days. The most common symptoms of delirium tremens include: Body tremors Changes in mental function Agitation or irritability Confusion or disorientation Decreased attention span Deep sleep that lasts for several days Delirium Excitement Fear Hallucinations Increased activity Quick mood changes Restlessness. Sensitivity to light, sound, or touch Sleepiness or fatigue Seizures