Hives during pregnancy: what to know

Hives during pregnancy should be assessed with pregnancy-safe treatment advice, while breathing or facial swelling symptoms need urgent help. Raised itchy welts may come and go, but not every itchy pregnancy rash is hives. The timing, appearance, and associated symptoms help a clinician choose the right approach.

Hives are temporary welts caused by chemical signals in the skin. They may follow an infection, food, medicine, heat, pressure, or another immune trigger, and a cause may not be found. Pregnancy can also bring other itchy eruptions that look different from hives and need their own assessment. Swelling of the lips, eyelids, hands, or feet may occur with hives and is called angioedema. Tell your maternity team about any new rash, especially if it is widespread or changing.

Use cool compresses, lukewarm bathing, fragrance-free products, loose clothing, and gentle patting rather than scratching. Keep a record of foods, medicines, supplements, illness, heat, and pressure before each episode. Contact your obstetric clinician, midwife, or pharmacist before taking an antihistamine, steroid, or new topical product; treatment choice depends on your pregnancy stage and personal health. Do not stop a prescribed medicine without advice.

Call emergency services for difficulty breathing, throat or tongue swelling, faintness, confusion, or repeated vomiting. Seek prompt maternity or medical assessment for a rapidly spreading rash, facial swelling, fever, blistering, painful skin, or intense itching without typical welts. Ongoing symptoms, a first episode, or a rash that disrupts sleep should be reviewed so hives are not confused with another pregnancy-related condition.

Ask whether the rash is consistent with hives, which medicine and dose are suitable in pregnancy, whether your current products should change, and which symptoms require maternity or emergency assessment.