High urine red blood cells can be seen for a variety of reasons: 1. The most common in children is acute glomerulonephritis, which is usually accompanied by pain in the throat and increased foam in the urine; 2. The most common in adults is urinary tract infection, stones, tuberculosis, tumors, etc. If caused by stones, it can be clearly diagnosed by urological ultrasound and urological CT, and can be treated by extracorporeal shock wave lithotripsy or surgical removal. If it is caused by infection, it is usually combined with urinary frequency, urinary urgency and pain, the most common one for women is cystitis, and the most common one for the elderly is tumor, which usually has no obvious symptoms and can appear obvious wasting and weakness, etc. The diagnosis can be clearly made through enhanced CT of the urinary tract.