What are the reasons for blood in a woman's urine after urination?

Patient's question:

I have an itchy lower body, and my underwear is always yellow. What's going on? Why do women have blood in their urine after urinating?

Doctor's answer:

Hello, it may be symptoms of a urinary tract infection. Urinary tract infections are caused by bacteria (rarely by fungi, protozoa, or viruses) directly invading the urinary tract. It is important to maintain good hygiene for the external genital area.
Hello, here is the usage method for ovulation test strips:
1. Collect urine in a clean, dry container. Morning urine must not be used. (Remember this)
2. The best time to collect urine is between 10 a.m. and 8 p.m.
3. Try to use a urine sample taken at the same time each day.
4. Reduce fluid intake 2 hours before collecting urine, as diluted urine samples may hinder the detection of the luteinizing hormone (LH) peak.
5. Hold the test strip with the arrow mark end immersed in the urine for about three seconds, then remove it and place it flat. Observe the results after 10–20 minutes, with the result to be read within 30 minutes. The liquid level should not exceed the MAX line.
6. It is best to start testing on the third day after cleaning. Test every day. Morning urine cannot be used. Continue testing until the two lines are equally dark or the second line appears.

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