Commentary:

This is just my best understanding of the situation at time of writing. Again, this is not a diagnostic tool, I am not a doctor.

Text summary: (click to open)

"Okay, so. Kidney stones happen in four distinct phases. Phase one, formation. The kidney naturally forms small stones out of minerals you ingest. Every kidney does this, most stones are just too small for you to really notice. Phase two, the journey. The stone has to travel from the kidney to the bladder through the urinary tract. Phase three, it’s in the bladder. Phase four, it comes out."
"Which phase am I in?"
"Phase two. That’s where the pain lives."
"I noticed."
"I’ll be right back."