I have a weak blood vessel in the roof of my mouth and not often but if I happen to scratch it , it bleeds really bad and it s almost unstoppable . I put pressure on and it and after a while it stops. I really don t know what to do about it at this point . I have had 7 surgerys and the last one I notice this vessel after they shove the breathing tube in my mouth it scratched the roof of my mouth and that s when I noticed it.
Hello and thank you for your question. You may have a hematoma on the roof of your mouth.  Or it may be normal vasculature.  The best bet is to ad Chat Doctor.  The roof of your mouth is heavily vascular, you have several arteries that supply the blood from the roof of your moutChatDoctoring from foramens in your skull from behind your front teeth and next to your molars.  The area if injured tends to bleed a lot and does require good pressure to gain control of the bleeding.  By scratching I am assuming with an pharyngeal tube in surgery or by accident with a tortilla chip. These items can cause trauma and cutting of the blood vessels.  If you have something where you gently scratch the roof or your mouth with a finger, and it bleeds then I recommend getting into a dental office for proper evaluation for pathologies. Wishing you well and good health.  I hope this helped you.