Knowing that many years ago I was a cystitis sufferer....now cured...a friend phoned last night for some advice.
She finds that very often, the morning after a couple of glasses of red wine, she suffers from mild cystitis. It's the only time she has these symptoms.
She can of course lay off the red with no problem but asked if I knew whether the red wine was the cause....and if so, why. I don't.