Hi, i have a sinus infection and went to my primary doctor. I blow my nose pretty hard to get mucus out, however, she told me that this is what is causing my nose to bleed. My question is, is this true, can blowing my nose too hard be a cause to my nose bleeding; or what i herd from a friend that has undergone a surgery that i have undergone this summer for a deviated symptom. He says that a vain my he popped and this is what is causing the bleeding. What is correct?