After pregnancy i developed hives which lasted for 4 years until i fell pregnant again , then again after birth they have come back is this common?

Happens: Chronic urticaria is a great mystery and ongoing research into is pathophysiology still has not elucidated all the answers. It may be a certain hormonal balance that influences your urticaria. Treatment is the same no matter what, a daily antihistamine. If you are pregnant or breasfeeding, zyrtec or Claritin (loratadine) are good choices.