What role does Progesteron play in allergy?

Progesterone is a sex hormone primarily known for its role in the menstrual cycle and pregnancy. In allergy research, it is considered immunomodulatory: it can shift the immune balance toward a Th2 response, which is central to allergic reactions. Some studies suggest progesterone may influence histamine release from mast cells and promote IgE antibody production. Hormonal fluctuations—such as during the luteal phase or pregnancy—have been linked to worsening of asthma and allergic rhinitis. However, the evidence is largely mechanistic, coming from cell and animal models; robust human clinical trials are lacking. Individual responses vary widely, and a direct causal role of progesterone in allergies is not firmly established. Consumer tests like MyBody-X do not typically include progesterone as an allergy marker. Anyone experiencing allergy-like symptoms should consult a healthcare provider for proper diagnosis and not rely solely on hormone testing.