Histamine intolerance occurs when our body is unable to eliminate excess histamine build up, which can lead to a variety of symptoms such as headaches, joint pain, allergies, itching, hives, nasal congestion, difficulty sleeping, diarrhea or loose stools, low blood pressure, anxiety and dizziness, among others. Once we know our problem and have decided to take Naturdao, questions may arise. Naturdao: Questions and Answers