Urethritis and syphilis can both recur. Urethritis is primarily due to bacterial cleansing, leading to inflammatory infection of the urinary tract. If personal hygiene is not maintained, it can cause recurrence of urethritis, or the presence of other urinary system diseases may also lead to its recurrence. A relapse of syphilis refers to the condition where, after treatment, the titer is controlled below 1:4, but during an intermittent observation period, the titer rises again, and the proportion of increase is relatively high. This situation is considered a recurrence of syphilis.