My youngest son had a reaction to the MMR shot. Two Ear, Nose and Throat doctors told me that my daycare provider wasn't watching him well enough after she complained to me of him having a profusely bloody nose while he was sitting on the floor in the middle of a room. After I started doing research on my own, I discovered that a reaction from the MMR shot can include bleeding disorders such as nose bleeds for no reason. He had this reaction within 14 days of having the MMR shot. One of my sisters was diagnosed with MS after having had the Hepatitis B vaccine while she was pregnant with her first child.