High histamine levels are caused by consuming too many histamine-rich foods, reduced ability to break it down (DAO enzyme deficiency), gut dysbiosis, certain medications, allergies, or mast cell issues like MCAS, all leading to histamine buildup from diet, microbes, or overactive immune cells overwhelming the body's systems.
Stopping a histamine dump involves avoiding triggers such as high-histamine foods, reducing stress, and using antihistamine supplements or medications. Long-term management strategies include maintaining a low-histamine diet and improving gut health.
Medical Conditions
Autoimmune disorders affect immune system function, which might lead to more histamine being released (11). Another condition causing elevated histamine levels is mastocytosis, rare disorder involving abnormal mast cell growth—the cells that make and store histamine (12).
Excess histamine can cause a variety of different symptoms which very often mimic allergic reactions. The most common symptoms are rashes (e.g. hives), itching, flushing, irritable bowel syndrome (IBS), indigestion, breathlessness, palpitations, migraines, dizziness, anxiety/panic, joint aches and nasal congestion.
People with mastocytosis have an increased risk of developing a severe and life-threatening allergic reaction. This is known as anaphylaxis. The increased risk of anaphylaxis is caused by the abnormally high number of mast cells and their potential to release large amounts of histamine into the blood.
The most common symptoms are rash, flushing, headache, and diarrhea. Less common symptoms include abdominal cramps, blurred vision, cold-like sensation, dizziness, nausea, sweating, and tachycardia. Severe reactions cause angioedema, tongue swelling, respiratory distress, cardiac arrest, and death.
Dysbiosis, leaky gut, and small intestinal bacterial overgrowth (SIBO) can impair DAO production and lead to histamine buildup. Nutrient Deficiencies: DAO enzyme function depends on certain nutrients, particularly vitamin B6, copper, and vitamin C. Deficiencies in these nutrients can exacerbate histamine intolerance.
When you have allergies, your immune system sees the allergy trigger as a threat, and it reacts as if the trigger is a dangerous invader by releasing histamine. The leakier blood vessels and increased inflammation lead to the allergy symptoms you experience.
Yes, magnesium helps regulate mast cell activity and can reduce histamine release. Does B12 stabilize mast cells? Yes, vitamin B12 supports nervous system health and may help stabilize mast cells, especially in MCAS patients with neurological symptoms.
The Role of Estrogen in Histamine Regulation
This is because estrogen can boost the release of histamine from mast cells, which leads to heightened symptoms such as itching, headaches, and hives.
There is currently no cure for histamine intolerance. The key to success is for the patient to learn to adjust to a low-histamine diet and manage the condition(s) until it either goes away, or for life.
Histamine-induced anxiety can feel like restlessness, a racing heart, palpitations, or a sense of unease.
Vitamin C. Vitamin C is a very common and well-known nutrient to strengthen the immune system and reduce inflammation. Vitamin C is also required to produce the necessary enzymes for the process of histamine breakdown, making it a vital anti-histamine nutrient.
To clear histamine, focus on a low-histamine diet (fresh, unprocessed foods), manage stress, get quality sleep, stay hydrated, and consider supplements like DAO or quercetin with medical guidance, as histamine is a natural body chemical, not something to "flush out" but rather to manage through diet and lifestyle to reduce overload.
Many people believe they experience a “histamine dump.” This phenomenon usually happens at night when your body releases a sudden surge of histamine. A histamine dump can interrupt your sleep and cause headaches, flushing, itching, anxiety, and a racing heart.
It is also possible to develop asthma-like symptoms such as wheezing, shortness of breath, or bronchoconstriction (narrowing of breathing passages). Cardiovascular: In some cases histamine intolerance can cause low blood pressure that can in turn dizziness or fatigue.
What does histamine do?
It is also important to note that you do not have to have an autoimmune condition to have histamine intolerance, but those that live with autoimmune diseases may be at a higher risk of an imbalance in either the DAO enzyme and/or histamine levels. What Does a Histamine Reaction Typically Look Like?
An unbalanced and elevated quantity of histamine in HIT seems to be the main consequence of the ingestion of histamine-containing foods [2]. Predominantly, in HIT, the intestinal enzyme diamine oxidase (DAO) has a reduced ability to metabolize and degrade histamine.
The role of vitamin B12 in histamine intolerance
Vitamin B12 supports the methylation process—a biochemical pathway that helps the body detoxify and regulate histamine levels. When B12 is lacking, methylation slows down, leading to higher histamine concentrations in the blood.
Histamines Unleashed
First, it sends a chemical signal to "mast cells" in your skin, lungs, nose, mouth, gut, and blood.
Histamine levels are another potent downstream target. Allergic symptoms exacerbate during nighttime and plasma histamine levels exhibit nocturnal peaks. In mastocytosis patients, peak levels of plasma histamine were observed in the early morning with the lowest in the afternoon (19).
Under normal circumstances your GP should be able to make a diagnosis, or send you to the right medical department that could investigate further.
So if you suffer from histamine intolerance, you should prefer calmer sports such as strength training, Pilates or yoga. Interesting fact: Cardio training releases histamine and other inflammation substances, but the effect only takes temporary (up to 72 hours).