Minutes after the consumption, hives and rashes are also bound to appear on the skin. Other symptoms observed are, headaches, skin itching, and painful rashes. As the Aldehyde Dehydrogenase enzyme is not present in the body, the digestive system is also unable to digest or store away the alcohol. In such a scenario, the person who is allergic to alcohol, is bound to suffer from symptoms such as stomach pain, abdominal cramps, skin itching, heartburn, and a severe headache.