Histamine is necessary for gut, brain, immune, and nervous system health. A histamine overload can cause hives, internal and external itching, excessive dryness, rashes, skin flushing, repeat bladder ...

Pityriasis rosea causes a rash that typically clears up on its ... When a person’s immune system recognizes a threat, it releases histamine and other chemicals to help fight infections and ...

Skin reactions, such as rashes, hives, and itching, are also common. Many people experience headaches, migraines, sinus congestion, and fatigue. In some cases, histamine intolerance can lead to ...

The rash usually happens without the presence ... He suggests that itchiness mostly can be resolved with diphenhydramine, a known antihistamine. Anxiety can cause fluctuations in body temperature ...