Self-catheterization is safe for the vast majority of people who need it, and it is the preferred method of bladder management for many conditions. Compared to having a permanent indwelling catheter, intermittent self-catheterization carries a lower risk of serious urinary tract infections, bladder stones, and kidney damage. That said, it does come with a small set of risks you should understand before you start.
Why It’s Considered the Safer Option
If you need help emptying your bladder on a regular basis, intermittent self-catheterization is generally the safest long-term approach. The alternative for many people would be an indwelling catheter (a tube that stays in your bladder continuously), which creates a constant pathway for bacteria and significantly raises the risk of infection the longer it remains in place. Self-catheterization avoids that by inserting a thin, flexible tube only when you need to drain urine, then removing it immediately afterward. Each session takes just a few minutes.
This approach is standard care for people with spinal cord injuries, neurogenic bladder, multiple sclerosis, and other conditions that prevent the bladder from emptying on its own. Millions of people worldwide perform it daily, often multiple times a day, for years or even decades.
Urinary Tract Infection Risk
Infection is the concern most people have, and it’s a reasonable one. Any time a catheter enters your urethra, there’s some chance of introducing bacteria into the urinary tract. In practice, though, the infection rate with self-catheterization is much lower than with indwelling catheters. Most people who self-catheterize will have bacteria present in their urine at some point, but the presence of bacteria alone doesn’t mean you have a symptomatic infection that needs treatment.
One reassuring finding: the CDC gives its highest recommendation to using a clean (non-sterile) technique for people who self-catheterize at home. Studies comparing sterile technique to simple clean technique found no difference in symptomatic urinary tract infection rates. This means you don’t need a perfectly sterile setup each time. Washing your hands thoroughly, cleaning the catheter tip or using a fresh single-use catheter, and keeping the area around the urethra clean is enough. This makes the process far more practical for daily life.
Urethral Trauma and Bleeding
Passing a catheter through the urethra does cause a small amount of friction, and over time this can lead to minor tissue irritation. Blood in the urine (hematuria) is the most visible sign of this, though studies report it occurs at a rate of roughly 2.2% per year in people who self-catheterize regularly. Small amounts of blood, especially when you’re first learning, are common and typically not dangerous.
More significant urethral trauma is uncommon but possible. False passages, where the catheter pushes through the urethral wall instead of following the normal path to the bladder, occur at a rate of about 2 to 9% per year. This is more likely in men, whose urethras are longer and have natural curves. False passages can make future catheterization more difficult, so proper technique and adequate lubrication matter a great deal.
Urethral Strictures Over Time
Repeated catheterization can, over months or years, cause scarring that narrows the urethra. This is called a urethral stricture, and it makes catheter insertion harder and sometimes painful. In women, strictures are rare, occurring in roughly 0.1 to 1% of cases. In men, the rate is considerably higher, ranging from about 4 to 25%, and the risk increases the longer you use intermittent catheterization.
Catheter type makes a meaningful difference here. In studies comparing hydrophilic-coated catheters (which have a slippery surface that activates with water) to standard uncoated catheters lubricated with gel, the stricture rate dropped from 11.5% with uncoated catheters to 3.1% with hydrophilic ones. If you’re going to be self-catheterizing long-term, the type of catheter you use is one of the most impactful choices you can make to protect your urethra.
How Catheter Type Affects Safety
Not all catheters perform the same. A randomized, participant-blinded crossover study tested hydrophilic-coated catheters against standard gel-lubricated uncoated catheters and found that hydrophilic catheters caused less microscopic bleeding and less pain during use. The key factor is friction during withdrawal. When you pull a catheter out, a slippery coating reduces the drag against your urethral lining, which is where most of the micro-trauma occurs.
Interestingly, the study also found that not all hydrophilic coatings are equal. One brand exerted significantly less friction than both the uncoated catheter and a competing hydrophilic product. So the coating technology matters, but so does the specific product. If you’re experiencing discomfort or repeated bleeding, switching catheter brands is worth discussing, because the difference in friction can be substantial.
Single-use catheters also reduce infection risk compared to reusing and cleaning catheters, though reuse remains common in some settings and hasn’t been shown to dramatically increase symptomatic infections when done with proper cleaning.
What Makes Self-Catheterization Safer
Most complications from self-catheterization are not inevitable. They’re influenced by technique, catheter selection, and consistency. A few factors reduce your risk significantly:
- Proper training: Learning correct insertion angle, depth, and how to recognize resistance prevents most cases of false passage and urethral trauma. Initial training from a nurse or continence specialist is standard.
- Adequate lubrication: Whether you use a pre-lubricated catheter or apply water-soluble gel yourself, reducing friction is the single most effective way to prevent urethral damage.
- Clean hands: Thorough handwashing before each catheterization is the most important infection-prevention step. Sterile gloves are unnecessary for home use.
- Consistent schedule: Catheterizing at regular intervals (typically every 4 to 6 hours) prevents your bladder from becoming overly full, which can cause its own complications including urine backing up toward the kidneys.
- Hydrophilic-coated catheters for long-term use: If you’ll be self-catheterizing for months or years, these reduce stricture formation, bleeding, and discomfort compared to standard uncoated options.
Who Faces Higher Risks
Men generally face more complications than women because the male urethra is significantly longer (about 20 cm versus 4 cm) and passes through the prostate gland, which can enlarge with age and create additional resistance. Stricture rates, false passage rates, and discomfort levels are all higher in men.
People with limited hand dexterity, such as those with spinal cord injuries affecting the hands or advanced multiple sclerosis, may struggle with consistent technique, which can increase trauma risk. Adaptive devices and catheters with grip features exist for this reason. Caregivers can also perform the catheterization if self-insertion isn’t feasible.
People who are immunocompromised or who have vesicoureteral reflux (where urine flows backward toward the kidneys) face a higher stakes situation if infection does occur, so monitoring for symptoms like fever, cloudy urine, or flank pain is especially important in these groups.