Alcohol Abuse
Alcohol in the body may hinder digestion by encouraging gastric acid production, which inhibits bowel movements and irritates the stomach lining, leading to stomach cramps, nausea, and vomiting. Too much alcohol increases a toxic compound known as acetaldehyde, which causes severe health conditions like brain impairment. However, nausea is one of the symptoms associated with high amounts of acetaldehyde in the body. Excess drinking a day prior may cause you to wake up with a hangover, which consists of headache, sensitivity to light, and nausea.