My 16 years old nephew is taking tb treatment and has got blood from urine twice and also a good amount from mouth twice, what causes can be?

Contact prescriber: The challenge to your question is not specifically knowing your TB regimen. Regardless, bleeding gums and blood in the urine is not normal- and it may be due to an adverse drug reaction to your TB meds, a drug-drug interaction, or some other coincidental cause. Your prescriber needs to know what's going on, to determine the best course of action.