Urethral stinging, frequent urination, blood in the urine is considered to be caused by urinary tract infection or urinary stones. 1. Female patients because the vagina, urethra, anus is very close, the urethra is easy to be contaminated, resulting in urinary tract infection, can appear frequent urination, urinary urgency, urinary pain, abdominal discomfort, blood in the urine and other symptoms. 2. Male patients who have urethritis can lead to redness and swelling of the urethral opening, frequent urination, painful urination, purulent discharge from the urethra, and blood in the urine. 3. Urinary stones, especially bladder stones, can cause bladder irritation signs, resulting in patients with frequent urination, urinary urgency, interruption of urinary flow, repeated friction of stones, irritation of bladder mucosa can also lead to hematuria. Therefore, the frequency of urination, urethral pain with hematuria, you need to improve the routine urinalysis and urinary ultrasound and other related examinations, a clear diagnosis and then choose the appropriate treatment plan.