The hazards of urethral intubation are possible complications during treatment such as guided urinalysis, cystoscopy, and bladder instillation of medications. Urethral intubation is generally not harmful, if the condition requires frequent long-term urethral intubation may appear urethral infection, urinary dysfunction and other complications. 1. Urethral infection: if long-term urethral intubation, it may cause irritation to the urethral mucosa. It is easy to cause local infections, which will lead to symptoms such as painful urination and blood in the urine. 2. Voiding dysfunction: some patients may lead to voiding dysfunction after urethral intubation, inability to urinate on their own, or low urine output. 3. Bladder atrophy: patients with long-term indwelling urinary catheterization may also have bladder that cannot be expanded, which may lead to thinning of the bladder wall over time, or even shrinking of the bladder or the appearance of small bladder, thus causing bladder atrophy. Therefore, after urethral intubation and removal of the urinary catheter, you need to pay extra attention to your own physical condition, and if you feel unwell, consult a doctor in time, and give standardized treatment as well as treatment under the guidance of the doctor.