What Is It?
Alcohol withdrawal is the changes the body goes through when a person suddenly stops drinking after prolonged and heavy alcohol use. Symptoms include trembling (shakes), insomnia, anxiety, and other physical and mental symptoms.
Alcohol has a slowing effect (also called a sedating effect or depressant effect) on the brain. In a heavy, long-term drinker, the brain is almost continually exposed to the depressant effect of alcohol. Over time, the brain adjusts its own chemistry to compensate for the effect of the alcohol. It does this by producing naturally stimulating chemicals (such as serotonin or norepinephrine, which is a relative of adrenaline) in larger quantities than normal. If the alcohol is withdrawn suddenly, the brain is like an accelerated vehicle that has lost its brakes. Not surprisingly, most symptoms of withdrawal are symptoms that occur when the brain is overstimulated.