I used to musturbate daily from last 10 years.but now where ever i musturbate blood comes out from mouth .while doing it or when i m not doing it.but when ever i go to toilet i spit blood from mouth.is this very serious problem .should i stop musturb?

i do not believe blood from your mouth has anything to do with masturbating

AS LONG AS BLOOD DOESN'T COME OUT OF YOUR PENIS THAN CONTINUE TO HAVE A HAPPY ENDING.YOUR PROBLEM IS YOU HAVE A PERIODONTAL INFECTION{GUM BLEEDING} AND SHOULD SEE A DENTIST RIGHT AWAY. YOU PROBABLY HAVE BLOOD IN MOUTH AFTER BRUSHING AND EATING SO YOUR PROBLEM IS ORAL NOT PENILE.

Maturbation does not mouth bleeding. You are likely to have gum disease that is causing the bleeding. See a dentist at your earliest convenience. You at risk of losing your teeth if you do not get it treated. Wish you good health!