Women who suddenly have blood in the urine and keep wanting to urinate may be caused by acute urethritis, acute cystitis, urethral stones and other causes. 1. Acute urethritis: acute urethritis may be caused by Neisseria gonorrhoeae, Chlamydia trachomatis, Mycoplasma and other pathogens caused by acute urethral infections, mainly manifested as urinary pain, blood in the urine, frequent urination, redness and swelling of the urethral orifice, urethral secretion, etc., when the patient develops acute urethritis, blood in the urine may be present and always want to urinate. 2. Acute cystitis: acute cystitis is a common urinary system diseases, due to the local congestion and edema of the bladder mucosa, inflammatory bleeding can occur, when the blood infiltrates into the urine, it is manifested as hematuria, and some patients may be accompanied by urinary pain, frequent urination, urinary urgency, urination difficulties, and urinary incontinence and other symptoms. 3. Urethral calculi: Urethral calculi generally refers to stones occurring in the urethral region, mainly manifested as urinary pain, hematuria, dysuria, urethral secretion and other symptoms, women appear suddenly blood in the urine and have been trying to urinate may be caused by urethral calculi. It is recommended that patients seek timely medical examination, clear causes for targeted treatment, in life, drink more water to facilitate the flushing of the urethra, while patients should also pay attention to the monitoring of the condition, regular review.