A hangover (medical terminology: veisalgia from , discomfort following overindulgence, and algia, pain) is the experience of various unpleasant physiological and psychological effects following consumption of ethanol, which can last for more than 24 hours. Typical symptoms of a hangover may include headache, drowsiness, concentration problems, dry mouth, dizziness, fatigue, gastrointestinal distress, absence of hunger, sweating, nausea, hyper-excitability and anxiety.