Women who have no symptoms and suddenly have blood in urine should consider acute urinary tract infection, especially acute cystitis, and then consider acute glomerulonephritis, IgA nephropathy, bladder cancer and other diseases. Acute cystitis can be triggered by fatigue, holding back urine, drinking less water, and can present with blood in the urine, frequent urination, painful urination, and lower abdominal discomfort. Acute glomerulonephritis first appear nasal congestion, runny nose, fever and other symptoms of upper respiratory tract infections, and then after 1-3 weeks will appear naked eye hematuria, the patient will think that the cold has long been well and there are no symptoms, all of a sudden, naked eye hematuria in fact, is an acute glomerulonephritis performance. While IgA nephropathy usually occurs 1-3 days after the infection before the appearance of hematochezia, the patient’s other symptoms are not very obvious, with the most prominent hematochezia. If middle-aged or elderly women suddenly develop painless hematuria, they must be alert to the possibility of bladder cancer. The common diseases that can lead to hematuria of the naked eye, such as urinary stones, are accompanied by corresponding symptoms, such as frequent urination, urinary urgency, urinary pain, lumbago, abdominal pain and other symptoms.