I vomited up blood a week ago. i haven't had any issues since, should i be concerned still? it wasn't like nasal drainage from a bloody nose or anything. doctor wants to scope my food pipe and stomach, is that necessary?

Vomiting : Vomiting up blood can be from a bleeding from a bloody nose which you cough or vomit up, it can be from a bleeding ulcer, it can be from a tear in a blood vessel in your esophagus or it can be from a cancer. A lot of your chances of having these things depends on things like your age, your smoking, alcohol intake, caffeine intake, spicy food choices, stress among other things. It is reasonable to have an endoscopy (egd) to help rule out the more dangerous and sinister problems.

Blood: You should get the scope and a chest xray as well. Dont take any blood thinners like aspirin and ibuprofen.