Painless blood in urine after menstruation may be related to ovulation bleeding, urinary stones, urinary system inflammation, urinary system tumor and other conditions. 1. Ovulation bleeding: Generally speaking, women’s ovulation is in the middle of two menstrual periods. If women ovulate in advance, or have longer menstrual periods, they may show ovulation after menstruation. Some women will have slight bleeding during ovulation, usually without abdominal pain, which may be manifested as hematuria. 2. Urinary stones: if the patient has kidney stones, ureteral stones, etc., as the stones run in the ureter, it may lead to scratches in the ureter, causing bleeding phenomenon. It is usually accompanied by pain in the lower back, and the pain is not obvious in some patients. 3. Inflammation of the urinary system: if the patient has cystitis or urethritis, the bladder mucosa will become edematous and congested due to stimulation, which will lead to hematuria, frequent urination, urgency and other symptoms. 4. Urological tumors: if the patient has urinary tumors, hematuria will occur, and hematuria is visible to the naked eye, basically not accompanied by other symptoms. It is recommended that women should seek medical treatment in time and do systematic examination under the guidance of doctors to clarify the causes of the disease.