my breast triple the size of my bra

Im a 34 A in my bra size n i went up to a 34 B what my cause problem

[Cleveland Clinic]

Dear ilovevonmon, There could be many reasons for change in bra size.  Depending on your age it could be normal growth or redistribution of tissue (less dense more fat tissue), weight gain, pregnancy.   Over the internet it is difficult to say whether or not this might just be a normal process, if you are more concerned it is best to bring this to the attention of your doctor who can assess in context of your individual situation.