A summary of the main symptoms we daily see on the consultations associated with a high level of histamine due to DAO deficiency is presented below.
It is worth to clarify that not all symptoms would be developed, but normally at least two or three are present. Likewise, it is not crucial that the same symptom occurs in the same family, in fact, DAO deficiency is usually the inherited syndrome and each individual has different symptoms.
Migraine is a complex syndrome that has been treated during decades with the same type of drugs. In the last years, the treatment of this syndrome is facing a drastic change, and has passed from been pharmacologic to dietary. Most of the migraine crisis appear when an accumulation of histamine occurs due to lack of activity of the intestinal enzyme DAO
Excess amounts of histamine cause increased gastric (stomach) secretions and also contractions of the soft muscle of the intestine. Most of these digestive symptoms are not serious threats to the health, but they are indeed uncomfortable and have impact in the daily life. At this point, it would be important to determine DAO activity.