For some, who are less chemically dependent, withdrawal symptoms might be as "mild" as merely getting the shakes, or the sweats -- or perhaps nausea, headache, anxiety, a rapid heart beat, and increased blood pressure.
Although these symptoms are uncomfortable and irritating, they are not necessarily dangerous. But they are often accompanied by the "craving" for more alcohol, making the decision to continue abstinence much more difficult to make.
Even the "morning after" hangover of someone who only occasionally drinks to excess, is actually a mild form of alcohol withdrawal from the excesses of the night before, as the alcohol content of their blood begins to drop. The symptoms can appear within a few hours after not drinking.
The DT's
However, within six to 48 hours after not drinking, hallucinations may develop. These usually are visual hallucinations but they can also involve sounds and smells. They can last for a few hours up to weeks at a time.
Also within this time frame after quitting, convulsions or seizures can occur, which is the point at which alcohol withdrawal can become dangerous, if not medically treated. The symptoms may progress to delirium tremens (DT's) after three to five days without alcohol. The symptoms of DT's include profound confusion, disorientation, hallucinations, hyperactivity, and extreme cardiovascular disturbances.
Once DT's begin, there is no known medical treatment to stop them. Grand mal seizures, heart attacks and stroke can occur during the DT's, all of which can be fatal.