A hangover is the unpleasant aftermath of excessive alcohol consumption. This term is also informally known as "the after-drunk state." While there are many suggested remedies for hangovers, scientific evidence supporting their effectiveness remains limited or largely theoretical. However, certain strategies show potential in alleviating hangover symptoms.

Many people who drink too much alcohol in the evening often experience headaches the next morning upon waking up. Particularly, patients who frequently suffer from migraines may only need to consume a small amount of alcohol for severe headaches to occur.