I've read the story of Willliam Shatner relaying how being under the terrible duress of a kidney stone attack feeling very self-consciousness as he groveled in nearly unendurable pain almost embarrassed at the thought of how the medical staff knowing him only as the intrepid Captain Kirk who usually faced similar scenarios with bravery and stoicism lay there as the mere real life mortal moaning like some pusillanimous, weak-kneed coward.
A most definite cringe-worthy story of bravery, adversity under agonizing circumstances. I've always been under the impression kidney stones were the result of eating too much red meat, surprised to hear how tea would also cause kidney stones, as well.
Being a wife who has watched her husband writhing on the floor with pain from the stones, I was told by the ER Dr that soda pop causes them.
Eliminating tea is a dietary change that is easy. If you have a history, I'd recommend trying it. Plus getting a KUB X-Ray before a major trip. I was going to Spain from JFK and did not want the Spanish medical system working on me.
The other complication is that I was on baby Aspirin for the heart. They have to wait 10 days before treatment so that can be eliminated, before lithotripsy.
I still drink herbal tea occasionally.