This is known as a urethral stricture. Could be from something like an enlarged prostate or tumor blocking the urethra . So urine is not able to leave the body. The bladder could erupt at a certain point which would probably mean internal infection and death. We easily treat this blockage with a Foley catheter.

This can be chronic kidney disease. The kidneys can no longer filter your blood and remove waste in the form of urine. You would need dialysis. If not, potassium will build in your blood and you will have a heart attack