8-year-old girl urine is red may be physiological factors, acute injury, acute urinary tract infection disease, urinary tract stones and other factors. 1. Physiological factors: for example, girls eat a lot of red dragon fruit or take rifampicin and other drugs, will lead to the color of the urine becomes red, but there are no red blood cells in the urine, adjust the diet and medication can be returned to normal. 2. Acute injury: for example, foreign body stimulation or external blows, resulting in local damage to the girl’s urethra, causing bleeding, will make the color of urine red, accompanied by pain, local swelling and other symptoms. 3. Acute urinary tract infections: for example, acute cystitis, which may be related to factors such as holding urine for a long time, poor hygiene, and other factors, the infection is more serious, so that the bladder is localized bleeding, which will cause hematuria, accompanied by pain in urination, frequent urination, urinary urgency and other symptoms. 4. urinary stones: for example, bladder stones, can be secondary to kidney stones, may also be related to long time holding urine, drinking too little water and other factors, in the position change or urination, the stone on the bladder caused by irritation, it will cause hematuria, accompanied by urinary difficulty, urinary frequency and other symptoms. 8-year-old girl urine is red, if accompanied by other obvious abnormal symptoms, it is recommended to go to the hospital urology department for examination and treatment, to avoid delaying the condition.