Have hematuria no pain, no nothing, and unknown why, dr. said to wait it will go away and it did but comes back few times after masturbation in urine?

Blood in the urine: Blood in the urine is an abnormal condition that should be evaluated by a urologist. Depending on your age, smoking status, and other health factors blood in the urine can be due to several conditions, some very significant like bladder or kidney cancer.

Painless hematuria: If you have painless hematuria (h), rbc's in your urine. See a urologist to rule out a UTI at first. If there is no uti, you need urological studies such as a renal ultrasound, ivp and possible a cystoscopy to visualize your bladder. If there are no problems, you need to be evaluated by a nephrologist to make sure there is no glomerular disease of your kidneys causing you to have h. Good luck.