A runny nose after swimming is extremely common, affecting between 40% and 74% of regular swimmers. The good news: it’s almost always caused by chemical irritation rather than infection, and a few simple steps can stop it quickly and prevent it from happening again.
Why Swimming Makes Your Nose Run
Chlorinated pool water doesn’t just sit on the surface of your nasal passages. It reacts with organic material (sweat, skin cells, body oils) to form compounds called chloramines. The highest concentration of these irritants hovers just above the water surface, right where you breathe. When chloramines contact the lining of your nose, they trigger inflammation and excess mucus production.
For some swimmers, this is purely a chemical irritation response. Research on symptomatic swimmers found that about 35% had a pattern of inflammation driven by immune cells called neutrophils, a hallmark of irritant exposure rather than allergy. Another 44% had pre-existing allergies that chlorine made worse. Either way, the result is the same: sneezing, dripping, congestion, and that waterlogged feeling that lingers after you’ve toweled off.
Rinse Your Nasal Passages After Every Swim
The single most effective thing you can do post-swim is flush the irritants out with a saline nasal rinse. A neti pot or squeeze bottle pushes a saltwater solution through one nostril and out the other, physically washing away chloramines, mucus, and anything else trapped in your sinuses. This thins congestion and reduces the swelling that causes stuffiness.
To do it safely, never use plain tap water. Tap water can contain trace amounts of bacteria and other organisms you don’t want in your sinuses. Use distilled water, water that’s been boiled for five minutes and cooled to lukewarm, or water passed through a CDC-approved filter. Mix in the saline packet that comes with your rinse kit, lean over a sink, tilt your head to one side, and let the solution flow in through the upper nostril and drain out the lower one. The whole process takes about two minutes and provides near-immediate relief.
Keeping a rinse bottle in your swim bag makes this easy to do in the locker room before you even leave the pool facility.
Block the Water Before It Gets In
Prevention beats treatment. The research conclusion on swimmer’s rhinitis is straightforward: it “can be prevented by avoiding the direct contact with chlorinated water.” The simplest tool for this is a swimmer’s nose clip. These inexpensive clips pinch your nostrils shut and keep pool water from entering your nasal passages in the first place. They take a few sessions to get used to, but many competitive swimmers wear them routinely.
If nose clips feel uncomfortable, applying a thin layer of petroleum jelly or a waterproof nasal balm around and just inside your nostrils before swimming can create a partial barrier against irritants. It won’t block water entry entirely, but it reduces how much chloramine contacts the mucous membrane.
Consider Switching Pool Environments
Not all pools irritate your nose equally. Indoor pools tend to be worse because chloramine gases build up in enclosed air rather than dispersing. Outdoor pools allow those irritants to dissipate into open air, so you breathe in far less of them.
Saltwater pools aren’t chlorine-free. They use a salt-chlorine generator that still produces chlorine, which still forms the same irritating byproducts. However, these systems typically maintain lower and more consistent chlorine levels, which some swimmers find less aggravating. If you have access to both options, it’s worth testing whether a saltwater pool reduces your symptoms.
Pool maintenance also matters. Well-managed facilities keep combined chlorine levels below 0.4 parts per million, the limit set by most health departments. Pools that smell strongly of “chlorine” (that sharp, chemical pool smell is actually chloramines, not chlorine itself) are often poorly maintained and more likely to irritate your airways.
When Over-the-Counter Treatments Help
If saline rinses and nose clips aren’t enough, two categories of medication can help. Antihistamine nasal sprays reduce sneezing and itching, and they work especially well if you have underlying allergies that chlorine aggravates. Corticosteroid nasal sprays (available over the counter at most pharmacies) target the inflammation itself, reducing swelling, congestion, and mucus production more broadly.
In head-to-head comparisons, corticosteroid sprays outperformed antihistamine sprays across nearly every symptom category, including congestion, sneezing, and nasal itching. If you’re choosing one product, a corticosteroid spray used daily during your swimming season is the stronger option. These sprays work best with consistent use over days or weeks rather than as a one-time fix.
For occasional swimmers who only need relief on pool days, a single-dose antihistamine tablet taken 30 to 60 minutes before swimming can blunt the response enough to make a noticeable difference.
When It’s More Than Irritation
A runny nose that clears up within a few hours of leaving the pool is standard swimmer’s rhinitis. But if your symptoms persist for days, change character, or get worse, something else may be going on.
Watch for thick, discolored nasal discharge (yellow or green), facial pain or pressure especially around the cheeks and forehead, a reduced sense of smell, bad breath, fatigue, or fever. These point toward a sinus infection rather than simple chemical irritation. Pool water can introduce bacteria into irritated nasal tissue, and repeated exposure without clearing the passages raises that risk. A sinus infection that lasts more than 10 days or keeps returning typically needs medical evaluation.