Hello and welcome to the forum. Thanks for your question. Please speak to your doctor as that is listed as a side effect that CAN happen with Entyvio but that it is one that requires physician notification of as soon as possible. https://www.drugs.com/sfx/entyvio-side-effects.html I think you will find this to be something others have had and especially if you are a woman between the age of 50 to 59. For some reason, that demographic really has a high percentage rate of this occurring. How long have you had Crohn's Disease and has the medication otherwise been working?