Hello and thank you for asking HCM.
I understand your concerns about your son.
There is no correlation between the gastric ulcer and the presence of blood in the urine of your son
-So either it is just a coincidence and your son has a
kidney stone or a stone in his bladder that is causing the presence of blood, or even an
urinary tract infection. He needs to do an urine test and an
ultrasound of his urinary tract in this cae
-The second option is that the blood in urine and the presence of the blood in his stool have the same reason.Maybe your son has a problem with his blood, low ability to clot,ect. so other tests need to be done.
I think it is something more serious so I suggest you check up your son again with a doctor, but for my opinion you should send him to the ER.
If you have any other question feel free to ask me.
Dr.Endri Katro