A balloon-like swelling that appears in the urinary passage while passing urine may occur due to a blockage or narrowing in the urine flow pathway, such as a urethral stricture, weakness in the urethral wall, infection, or occasionally a swelling near the urinary opening. This can cause urine to collect temporarily and produce a bulging or ballooning effect during urination. Some people may also notice a weak urine stream, pain, burning, dribbling of urine, repeated urinary infections, or difficulty emptying the bladder completely. This problem should not be ignored, because untreated urinary blockage can sometimes lead to infection or bladder problems over time. It is important to consult a urologist for proper examination and tests, such as urine analysis, ultrasound, or special scans of the urinary tract, to find the exact cause. Treatment depends on the underlying problem and may include medicines, treatment of infection, or sometimes a minor procedure to correct narrowing or blockage if present. Until you are evaluated, drink adequate water, avoid holding urine for long periods, and do not take medicines on your own without medical advice. Seek urgent medical care if you develop severe pain, fever, inability to pass urine, blood in urine, or increasing swelling.