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10. Rashes Appear During the Menstrual Cycle

Though rare, some people develop hives as part of the hormonal changes in their menstrual cycle. Known as autoimmune progesterone urticaria, the rashes usually appear about seven to 10 days before the period begins.

Hives often improve during pregnancy, though there are uncommon cases of rashes appearing and worsening in the third trimester. This is most common in first pregnancies.

Young Woman Suffering From Strong Abdominal Pain While Sitting on Sofa at Home PixelsEffect/ Getty Images
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