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Histamine is a chemical that is naturally produced by the human body and is involved in immune responses and several physiological functions. It is also present in some foods and insect venom. Histamine triggers allergy symptoms and is responsible for causing inflammation in the body. The body's histamine levels can be managed through the use of antihistamines, which are commonly used to treat allergies and asthma. Histamine intolerance (HIT) is a proposed condition where the body cannot break down histamine, leading to gastrointestinal and allergy-like symptoms. While HIT is controversial, it is believed that high histamine levels can affect multiple systems in the body.
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What You'll Learn
Histamine is a chemical that the immune system releases
Histamine is involved in several immune responses, including nociception, a pain response triggered when the body perceives harm. It also plays a role in vasodilation, the widening of blood vessels to increase blood flow, and bronchoconstriction, the tightening of muscles in the airways to restrict airflow. Histamine increases gastric acid secretion, aiding the stomach in maintaining its typical acidity, and stimulates mucus production in the airways to capture allergens.
The immune system releases histamine as a defence mechanism against allergens. Allergens are substances that the immune system identifies as threats, such as pollen, pet dander, or dust. Histamine triggers a response to eliminate these allergens from the body or skin, causing symptoms like sneezing, tearing, and itching. Antihistamines are commonly used to treat allergy symptoms by preventing histamine from binding to cells and causing excessive inflammation.
In addition to its role in allergies, histamine has other important functions in the body. It helps regulate the sleep-wake cycle and cognitive function. Histamine is also involved in various bodily processes that can impact the gastrointestinal tract, brain, and overall immune response. Histamine is derived from the decarboxylation of the amino acid histidine, a reaction catalysed by the enzyme L-histidine decarboxylase. It is a hydrophilic vasoactive amine that is either stored or rapidly inactivated by specific enzymes.
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Histamine regulates sleep-wake cycles and cognitive function
Histamine is a chemical compound that plays a role in immune responses throughout the body, including allergic reactions. It is produced by the immune system and acts as a neurotransmitter for the brain, spinal cord, and uterus. Histamine is also involved in various bodily functions that can affect the gastrointestinal tract, brain, and overall immune response. Histamine is deemed wake-promoting, as drowsiness is a common side effect of certain anti-allergy medications that block histamine signalling. Histamine neurons are generally active during wake states and inactive during sleep. Histamine release in the hypothalamus and other target regions is highest during wakefulness.
The histaminergic system is exclusively localized within the posterior hypothalamus and projects to almost all the major regions of the central nervous system. Histamine, acting via H1 and/or H3 receptors, plays a pivotal role in the regulation of sleep-wake cycles. Administration of histamine or H1 receptor agonists induces wakefulness, while administration of H1 receptor antagonists promotes sleep. The H3 receptor, on the other hand, regulates the synthesis and release of histamine. Activation of the H3 receptor reduces histamine release and promotes sleep, while blocking the H3 receptor promotes wakefulness.
Research suggests that histamine helps stabilize sleep-wake states, ensuring that each stage of sleep has clear boundaries. In support of this, one study found that mice lacking histamine experienced more REM sleep and transitioned more frequently between sleep and wake states than control animals. Additionally, hypocretins (also known as orexins), which are peptide neurotransmitters found in the hypothalamus, strongly activate the histamine-producing neurons. This mechanism is believed to be key in promoting wakefulness and regulating sleep.
While histamine is known for its role in allergies and itchiness, it also plays a role in regulating sleep-wake cycles and cognitive function. Histamine neurons promote wakefulness by activating neurons in the cortex that drive arousal and by inhibiting neurons that promote sleep. Histamine is involved in various cognitive functions, such as motivation and cognition, and interacts with other neurotransmitter systems, including serotonin, norepinephrine, and dopamine.
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Histamine intolerance (HIT) is caused by an inability to digest histamine
Histamine intolerance (HIT) is a proposed condition caused by an inability to digest histamine, leading to gastrointestinal and allergy-like symptoms. Histamine is a chemical found throughout the body, playing a role in allergies and other conditions. It is produced by the immune system to send messages between cells and is involved in local immune responses and physiological functions in the gut. Histamine is also a neurotransmitter for the brain, spinal cord, and uterus.
When the body cannot break down histamine properly, it can build up and cause symptoms such as headaches, nasal congestion, digestive issues, and irregular periods. It can also lead to allergy-like symptoms, including swelling of the lips, tongue, or throat, trouble breathing, and a sudden drop in blood pressure. While HIT is a proposed condition, some experts suggest that other conditions may cause similar symptoms, so it is important to consult a healthcare provider for an accurate diagnosis.
Certain factors can affect histamine levels in the body. For example, genetics may play a role, as gene mutations can cause the body to produce less or dysfunctional DAO (diamine oxidase), an enzyme that breaks down histamine. Additionally, certain medications can temporarily block DAO functions or prevent their production, leading to increased histamine levels. Gastrointestinal disorders, such as inflammatory bowel disease (IBD), can also impact DAO levels and cause histamine intolerance.
Diet can also influence histamine levels. Histamine-rich foods can cause DAO enzymes to function improperly, and certain foods can block DAO enzymes or trigger histamine release. Bacterial overgrowth in the gut, resulting from improper food digestion, can lead to increased histamine production. Furthermore, certain medications, including specific pain medications and contrast agents used in medical imaging, can increase histamine levels in the body.
While HIT is characterized by an inability to digest histamine, it is essential to note that histamine intolerance is not a sensitivity to histamine but rather an indication of high histamine levels in the body. This intolerance can affect multiple systems due to the presence of histamine receptors throughout the body. Managing HIT involves treating the symptoms and regulating histamine levels through medications such as antihistamines, mast cell stabilizers, and H2 inhibitors.
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Histamine triggers include allergens and certain foods
Histamine is a chemical that plays a role in allergies and several conditions. Histamine triggers include allergens and certain foods. Histamine is produced by the body to help the immune system respond to allergy triggers. Histamine is involved in immune responses all over the body.
When you come across an allergy trigger, your immune system identifies it and launches a chain reaction to defend you. It sends a chemical signal to "mast cells" in your skin, lungs, nose, mouth, gut, and blood. The message is to release histamines, which are stored in the mast cells. Histamines boost blood flow in the area of the body affected by the allergen. This causes inflammation, allowing other chemicals from your immune system to step in and repair the damage.
Histamine is also involved in various bodily functions that can affect your gastrointestinal (GI) tract, brain, and overall immune response. It regulates your sleep-wake cycle and cognitive function. Histamine is a monoamine neurotransmitter derived from the decarboxylation of the amino acid histidine, a reaction catalysed by the enzyme L-histidine decarboxylase.
Some foods that trigger histamine responses are called histamine liberators, which means they have high levels of substances called biogenic amines. Histamine is one of several biogenic amines. Some people may be sensitive to these foods, which include aged and fermented foods and alcohol (especially red wine). Histamine poisoning can occur if you eat fish that weren't kept at safe temperatures and spoiled before cooking. These fish can build up high levels of histamines, making you sick.
Histamine intolerance occurs when you have high levels of histamine in your body. Symptoms include an upset stomach, headache, or allergy symptoms from certain foods. Histamine liberators can cause histamine poisoning, also called histamine intoxication, which usually happens as a food poisoning outbreak. It is well-documented and is usually traced back to certain types of fish.
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Antihistamines help treat allergy symptoms
Histamine is a chemical that plays a role in allergies and several other conditions. It is produced by the body to help the immune system respond to allergy triggers. Histamine triggers include allergens and certain foods. When the body encounters a threat from an allergen, it releases histamine, causing an allergic reaction with symptoms like itchy, watery eyes, a runny or blocked nose, sneezing, skin rashes, and nasal congestion.
Antihistamines are a common medication that can manage histamine levels and treat allergy symptoms. They work by blocking or reducing histamine, a chemical that causes allergic reactions. There are two major subtypes of antihistamines based on which histamine receptors they block: H1 and H2. H1 antihistamines help treat allergy symptoms triggered by dust or pollen, while H2 antihistamines reduce stomach acid production involved in GI tract symptoms.
H1 antihistamines are commonly used to treat allergic rhinitis (hay fever), allergic conjunctivitis (pink eye), allergic skin reactions such as atopic dermatitis, sinus infections, and angioedema (skin swelling due to an allergic reaction). Over-the-counter H1 antihistamines like diphenhydramine (Benadryl) and cetirizine (Zyrtec) are often used to manage chronic allergies or asthma resulting from an exaggerated immune response.
H2 antihistamines, on the other hand, are used to treat indigestion and reduce stomach acid production. Examples of H2 antihistamines include cimetidine (Acid Reducer®, Tagamet®), famotidine (Pepcid®), and nizatidine (Axid®). It is important to note that not all antihistamines work for everyone, and individuals may need to try several types to find the most effective one for their specific allergy symptoms.
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Frequently asked questions
Histamine is a chemical that is produced by the immune system in response to injury or allergic substances. It is involved in local immune responses and regulates physiological functions in the gut, brain, and overall immune response.
Histamine is a signalling chemical that opens up blood vessels, constricts airways and the gastrointestinal tract, and creates mucus. It also regulates the sleep-wake cycle and cognitive function.
Histamine is released by mast cells and white blood cells called basophils. Histamine can also be released by bacteria in spoiled food, such as fish, and in fermented foods and beverages.
You can reduce histamine in your body by taking antihistamines, DAO supplements, or medications that prevent the release of histamine. A low-histamine diet may also help, which includes fresh meat, chicken, eggs, some fish, and fresh fruits and vegetables.
High histamine levels can cause allergy symptoms such as a runny nose, watery eyes, constriction of bronchi, and tissue swelling, and an upset stomach. It can also cause headaches, sleep loss, and aggressive behaviour.
