Suddenly urinate very urgently but urinate a little bit may be mental urinary frequency, urinary tract infection, prostate disease, urinary tract stones and other factors. 1. mental urinary frequency: encountered some unexpected things, psychological overstress, easily induced mental urinary frequency, will suddenly urinate very urgently, but the amount of urination is relatively small, there is no other urinary abnormalities. 2. Urinary tract infection: such as urethritis, may not pay attention to the lower body hygiene, resulting in localized congestion and edema of the urethra, which will cause sudden urinary urgency, but the amount of urine is very small, may also be accompanied by urinary pain. 3. Prostate disease: prostatitis is common in young and middle-aged men, causing symptoms such as urinary urgency, incomplete urination, and low urine output, which may be accompanied by perineal swelling and pain. Prostate hyperplasia is common in middle-aged and older men, manifested by frequent urination, urinary urgency, increased nocturia, and also sudden symptoms of urinating very urgently but a little bit of urine. 4. Urinary stones: such as urethral stones, bladder stones, etc., due to the presence of stones, may block the urinary tract, and cause irritation to the urinary tract, will cause urinary urgency and low urine volume, may also be accompanied by urinary pain, urination difficulties, hematuria and other symptoms. Suddenly urinate very urgently but urinate a little, and accompanied by other obvious urinary abnormalities, it is recommended to consult a doctor for a detailed examination, to clarify the specific causes, and timely treatment.