Alcohol is a depressant, it literally tamps the activity of nerve cells down. The thing is, we have molecules in our bodies that already do that, but balance that effect with other molecules that excite the nervous system to create a balanced system. But to adjust to all the extra depressant, our bodies start to produce less of the natural ones. When you do that for a while, and then suddenly stop, your brain no longer has enough depressing molecules to keep the system balanced, so the cells end up going into overdrive. This is where you get hallucinations and seizures, which are hallmarks of dangerous levels of withdrawal
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