I have lived with PKD for many years. About 2 years ago, I was in a Whirlpool and I had the jets concentrating on my lower back (kidney area). That night I encountered severe pain and went to the ER overnight with a burst kidney cyst. I speculated that it was due to the jets. My physician thought it was just coincidence. Has anybody else had either a whirlpool incident or a blow to the kidneys that caused a cyst to burst?