I have coughed up blood in massive amounts quite a few times. One of the first times it happened was during a "clean out" actually...I was very worried and immediately called in the nurse. They didn't know why it was happening...So, the next day I asked the doc and he explained that maybe during a coughing jag, I could have broken a few blood vessels...It doesnt happen too often but, when it does, it can be frightening, I know. I guess it just can be a normal thing at times to cough up blood. Hopefully, it wont happen again for you, me or anyone else for that matter, very soon!