Out of Breath During Exercise? It May Your Throat, Not Your Lungs

July 30, 2026

A man out of breath after running on the beach

You’re in the middle of a brisk walk, swim or other activity when suddenly, it feels like you can’t breathe. Not the regular breathlessness of exercise, but a sensation like your airway is closing off. You slow down or stop moving, and it passes. Your lungs check out fine, and an inhaler doesn’t seem to help. So, what’s happening?

For many people, the cause of these anxiety-provoking symptoms is in the throat, not the lungs. N. Scott Howard, MD, MBA, a laryngologist at University Hospitals, and speech-language pathologist Alexandria Rakowski, SLP, explain a condition that’s commonly misunderstood but highly treatable.

What Is ILO and What Does It Feel Like?

During exercise, the vocal cords typically open wider to take in more air and increase oxygen levels in the body. When that process goes wrong, the vocal cords close during inhalation, creating a sense of tightness in the throat and a feeling that air can’t get in.

The condition is called inducible laryngeal obstruction, or ILO. It’s also been called vocal cord dysfunction in the past. “It’s a condition associated more with the throat than the chest,” Dr. Howard explains. “Patients feel a tightness in their throat, and they often can’t use their voice or talk. There’s a sense that they’re not in control of their breathing the way they normally would be.”

For many, the experience is genuinely frightening. “Some may feel a sense of doom, like ‘I’m going to die,’” Dr. Howard says. “That anxiety can make the episode worse, because that fear response triggers even more tension in the throat.” Many patients develop a warning sensation just before an episode hits, and the anticipation of it can also become a trigger.

What Causes ILO?

ILO affects a wide range of people, but it is particularly common in athletes, competitive performers and military personnel, where a high level of physical performance is required and unexpected breathing difficulty can have significant consequences.

Triggers vary from person to person but commonly include:

Intense exercise, particularly running, swimming or other high-demand activities.
Acid reflux, which is especially common during exercise as the diaphragm moves and stomach acid can reach the throat.
Strong smells, smoke or air pollution.
Cold air or temperature changes.
Stress and heightened emotion.
Excess mucus sensation in the throat.

ILO and asthma can feel remarkably similar – both involve sudden difficulty breathing, chest or throat tightness – but they are different in important ways. Asthma involves inflammation in the lower airways and responds to inhaled medications like albuterol. Reaching for an inhaler during an ILO episode is unlikely to provide much relief. ILO episodes often resolve more quickly than an asthma attack and are typically tied to specific triggers, such as exercise, odors or intense emotion, rather than typical allergen exposure.

To help confirm the diagnosis, an ear, nose and throat (ENT) specialist examines the vocal cords using a thin, flexible scope passed through the nose. They try to visualize the larynx while a patient is breathing, ideally during or after troubling symptoms, to see how the vocal cords are moving in real time.

Getting Back in the Game: How ILO Is Treated

When ILO is identified it is highly treatable, not with medication or surgery, but with specialized speech therapy. Rakowski works with people who have ILO symptoms on two goals: giving them tools to stop an episode when it happens and building strategies to prevent episodes from occurring in the first place.

“Even after our first visit, patients already leave with tools so that when an episode happens, they’re able to resolve it,” Rakowski says. “They automatically feel more confident and more in control, and that itself reduces the anxiety that can fuel future episodes.”

Techniques include:

Controlled, relaxed throat breathing. An effective shift away from the forceful breathing response that tends to worsen episodes.
Nasal sniffing techniques. Sniffing through the nose with the lips pursed, to keep the larynx open.

Because ILO is most often triggered during physical activity, therapy strategies are also practiced in those conditions. “We have a whole gym we use for therapy,” explains Rakowski. “We put runners on the treadmill, or have rowers use the rowing machine. We try to create the conditions for an episode so we can practice breathing in the specific setting where it happens.”

Most patients need only a handful of visits to see results. “Typically, within four to six weeks of therapy, patients make real progress,” Rakowski says.

Support Beyond Breathing Alone

For most patients, breathing retraining with a speech therapist is effective alone. For those whose acid reflux plays a role, Dr. Howard often also recommends over-the-counter products that create a physical barrier on top of stomach acid – such as Gaviscon or Reflux Gourmet – taken after meals, before athletic events or before bed. These work differently from acid-reducing medications by physically preventing regurgitation rather than changing acid content.

For a smaller subset of patients whose anxiety is a significant driver – where the fear of an episode has become so consuming that it’s limiting daily life even beyond the episodes themselves – Dr. Howard sometimes brings in behavioral health for support. Low-dose SSRIs or anxiety treatment can complement the speech therapy approach in those cases. “Not every patient will need medication, but it is another tool we have,” he explains.

The most important thing to know about ILO, Dr. Howard adds, is that it is usually not dangerous. The airway does not close completely, and episodes end. But it can be disabling, frightening and isolating when left unaddressed. “When people begin to feel like they regain control, that alone is a big step forward in managing this condition,” he says.