Urine is red after pregnancy, it may be caused by physiological factors, or it may be caused by preeclampsia, urinary tract stones or urinary tract infection. 1. Physiological factors: such as eating food with red pigment, such as dragon fruit, red pigment with the urine out of the body, the color of urine is red, a few times after urination, the color of urine will gradually become normal. 2. Pre-eclampsia: Before the 28th week of pregnancy, pre-eclampsia can be caused by embryonic factors, systemic diseases of pregnant women, genital anomalies or bad habits, etc. It can cause vaginal bleeding accompanied by paroxysmal pain in the lower abdomen, and the urine may be mixed with blood, which is red in color. 3. Ureteral stone: If ureteral stone occurs in pregnant women, the stone passes through the ureter and breaks its mucous membrane, which may lead to hematuria. 4. Urinary tract infections: uterine enlargement can lead to poor urinary drainage, easy to occur urinary tract infections, when caused by cystitis, in addition to frequent urination, urinary urgency, urinary pain bladder irritation signs, some patients may also appear hematuria. Red urine during pregnancy, it is recommended to go to the hospital specialist in time, the cause of the symptomatic treatment.