Yes..stress is a big contributor..last year I had tremendous stress when a company I worked at for 12 yrs. closed. I had a case of hives that lasted 3 months..3 trips to the emergency room..we tried to trace the cause and couldn't..I believe stress..also I now have them back after just finding out my sister has stage 3 Ovarian cancer..so I am totally convinced it is stress. I'm on week 2 now. Good luck,hopefully for you only a day or two.