If you have a telerance for alcohol it can increase the likelihood of drinking more or a drug overdose.
Tolerance, Addiction, Dependence
Brain changes don't lead to alcoholism. Alcoholism can lead to brain changes.
Stage 1
If you drink to much
Alcohol tolerance refers to responses to the effects of ethanol in alcoholic beverages. This includes the speed of recovery from insobriety and resistance to alcoholism.
Alcoholism.
Tolerance refers to the blood alcohol level necessary to cause impairment of mental and physical function. As alcoholism develops, the ability to tolerate alcohol also increases.
High tolerance for alcohol is one of the first signs of developing alcoholism. The problem has already begun at that point.
The "parts" of alcoholism are the same as those for addiction to any other drug. They include dependence, tolerance and withdrawal. Of course, there are many other "parts", because alcoholism is a very complex disease.
You have developed a tolerance to the drug, and are progressing toward chronic alcoholism.
You will rely on alcohol to relieve you pain and stress.
There are a number of alcohol agencies around the world. In the US, the lead agency is the National Institute on alcohol Abuse and Alcoholism (NIAAA).