The most common diseases with recurrent episodes of carnal hematuria: 1. Urological tumors, especially bladder tumors can recur with the growth, progression and central necrosis of the tumor. Generally, it is not accompanied by any urinary tract irritation symptoms and no pain, and the hematuria can be reduced after drinking more water, but it can recur. 2, urinary tract stones such as bladder stones, kidney stones, etc. can cause recurrent hematuria, which is usually accompanied by acute or chronic pain in the area where the stones are located, such as frequent urination, urgent urination, lumbar pain with 3. Urinary tract infections, especially acute cystitis, can appear as flesh-eye hematuria, mostly accompanied by urinary frequency, urinary urgency with fever or with small abdominal pain, etc., which can be identified by routine urinalysis.