Alcohol
Hangovers: Why They Happen, What Helps, and How to Recover Safely
A hangover is a collection of symptoms that can occur after alcohol intake, usually as blood alcohol levels fall toward zero. Symptoms may include headache, nausea, fatigue, thirst, dizziness, light sensitivity, sound sensitivity, poor concentration, stomach upset, irritability, anxiety, low mood, sweating, shakiness, and reduced exercise performance.