urticaria
"I started taking Xolair, and while it eliminated my hives (yay!) I experienced terrible stomach problems (constant gas and bloating) and weight gain of about 10 lbs that I cannot seem to lose. (I'm small so 10 lb is a lot) It's is hugely annoying- I feel pregnant, and I am very active and fit and have always been able to maintain my weight, and now I can eat almost nothing and work out and it's still there. Going off of Xolair, hope this problem resolves itself. Annoying!"