People suffering from a hangover can alleviate an upset stomach by eating bland foods such as crackers and toast, according to Mayo Clinic. Pain relievers can sometimes help with other symptoms but might aggravate an upset stomach.
People suffering from a hangover might also have low sodium and potassium levels, notes Mayo Clinic. Bullion soup can help replenish these nutrients. Another common symptom of hangovers is dehydration, so people recovering should drink plenty of water or fruit juice. However, the only real cure for a hangover is time, so sufferers can take a nap and hope they sleep long enough to get past its symptoms.