The primary job of the liver is detoxifying the body, which removes harmful substances from the body and makes them less harmful. This is important because we always encounter harmful chemicals in everyday life.
When it comes to alcohol, the story might be a little different. Your liver breaks down alcohol to acetaldehyde which can be harmful in certain doses and then into acetate before it leaves as carbon dioxide and water. But there is a limit to the amount of alcohol that your liver can process and it starts to enter the blood just the way it is.
One of the effects of alcohol is dehydration which leads to some of the symptoms you experience as a hangover.
This hangover makes the average person reach for analgesics in the morning. If this analgesic is paracetamol, this can be a bad idea. Here’s why:
Paracetamol is also broken down by the liver into a toxic substance which is eventually cleared by the liver. Depending on the amount of alcohol you had the night before, your body might still be dealing with the alcohol in your bloodstream adding paracetamol to that might be detrimental to your liver theoretically.
Aspirin, ibuprofen, and other nonsteroidal anti-inflammatory drugs (NSAIDs) may help with headaches and overall achy feelings. NSAIDs, though, may irritate a stomach already irritated by alcohol and if you have ulcers, it is best to avoid
There are other ways you can treat a hangover, read that here