The correct spelling of the condition is "cystitis", pronounced /sɪˈstaɪtɪs/. This common inflammation of the bladder can cause pain, discomfort, and frequent urination. The word is derived from the Greek "cystos" meaning "bladder". While the misspelling "kysthitis" is not uncommon, it does not accurately reflect the correct pronunciation or origin of the word. Using proper spelling and pronunciation is essential for clear communication and accurate medical treatment.