Blood after urination in 22 weeks of pregnancy is considered to be caused by cystitis, cervical polyps and preeclampsia. 1. cystitis: due to bacterial or fungal invasion of the urinary tract, which leads to bladder infection, it is easy to cause pregnant women to have blood after urination, accompanied by frequent urination, painful urination and other symptoms. 2. Cervical polyps: After pregnancy, due to the increasing level of hormones in the body, cervical polyps will be induced to increase in size or induce the occurrence of cervical polyps. When there is abnormal tissue in the cervix, it will cause bleeding symptoms with activities or even urination. 3. Pre-eclampsia: due to exertion, luteal insufficiency and other reasons, may cause pre-eclampsia, there may be blood after urination. The phenomenon of blood after urination in 22 weeks of pregnancy may also be caused by other reasons, it is recommended to go to the hospital for examination and treatment according to the cause of this symptom.