If your asthma has worsened after a COVID-19 infection, or you’re experiencing asthma-like symptoms for the first time, you’re dealing with a recognized pattern. People who’ve had COVID are roughly twice as likely to develop new-onset asthma compared to those who haven’t been infected, with studies showing incidence rates of 1.6% in COVID patients versus 0.7% in matched groups. The good news: most of the same tools that treat traditional asthma work here, though the underlying airway damage has some distinct features worth understanding.
Why COVID Triggers Asthma Symptoms
The virus that causes COVID-19 enters your cells through a receptor concentrated in the smallest airways and the air sacs deep in your lungs. This means the damage tends to hit your smaller breathing passages hardest, causing inflammation that narrows them, makes them overly reactive, and creates mucus plugs. The result is a condition researchers call small airways disease: air gets trapped in your lungs, they become overinflated, and gas exchange suffers. That’s why you might feel short of breath even when standard tests look relatively normal.
The breathlessness isn’t always purely a lung problem, either. Reduced physical activity during and after illness, lingering systemic inflammation, and immune-related damage outside the lungs can all contribute. This is why post-COVID breathing difficulties sometimes resist treatment that targets only the airways.
Getting the Right Diagnosis
Pulmonary function testing is the starting point for anyone with persistent, worsening, or new respiratory symptoms after COVID. International guidelines specifically recommend it for post-COVID patients. The most common findings include reduced lung capacity, impaired ability to transfer oxygen into the blood, and sometimes restrictive patterns where the lungs can’t fully expand. Interestingly, the ratio of air you can force out in one second compared to your total exhaled breath (a classic marker of obstructive asthma) often stays relatively normal, even when other measurements are off.
This matters because it means your post-COVID breathing problems might not look exactly like textbook asthma on testing. Your doctor may need to look at the full picture, including small airway function and gas transfer, rather than relying on a single number. About a quarter of people evaluated for persistent post-COVID respiratory symptoms already had asthma before their infection, so distinguishing between a pre-existing condition that flared up and genuinely new airway disease is an important part of the workup.
Inhaled Corticosteroids as First-Line Treatment
Inhaled corticosteroids remain the cornerstone of treatment for airway inflammation after COVID, just as they are for traditional asthma. A meta-analysis of six trials found that patients using inhaled steroids were about 20% more likely to achieve clinical recovery at both 7 and 14 days compared to those receiving usual care alone. Among the specific medications studied, budesonide showed the clearest benefit, with recovery rates roughly 32% better than standard care. Another inhaled steroid, ciclesonide, did not show the same significant improvement in trials.
In one key trial, only 1% of patients using inhaled budesonide (at a dose of 800 micrograms twice daily) needed urgent medical care or hospitalization within 28 days, compared to 14% in the usual-care group. A separate, larger trial using the same dose for 14 days found a recovery time benefit of about 3 days, though it didn’t significantly reduce hospitalization rates. If your doctor prescribes an inhaled steroid for post-COVID airway symptoms, budesonide has the strongest evidence behind it.
Managing Severe or Resistant Symptoms
For people with severe asthma that doesn’t respond well to inhaled steroids, biologic therapies (injectable medications that target specific parts of the immune response) are an option. Current guidelines recommend continuing these treatments through and after COVID infection to maintain asthma control. Reports on several biologics, including those targeting allergic inflammation and eosinophil-driven disease, show no significant negative impact from use during or after COVID.
One case that illustrates the potential: a 23-year-old woman with severe, allergy-driven asthma saw a 26% improvement in her lung function after starting a biologic that blocks two key inflammatory signals. Her mucus overproduction and airway hyperreactivity both improved substantially. While biologics aren’t first-line for most people, they’re worth discussing with a specialist if standard inhalers aren’t controlling your symptoms.
Breathing Exercises and Pulmonary Rehabilitation
Structured breathing exercises are one of the most consistently effective non-medication treatments for post-COVID respiratory symptoms. Across multiple clinical trials, patients who performed breathing exercises showed statistically significant improvements in breathlessness compared to control groups. This held true whether the exercises were done in person or through telerehabilitation programs, and whether they were performed alone or combined with aerobic and strength training.
Programs that combined breathing exercises with techniques like myofascial release (hands-on therapy targeting the chest wall and surrounding tissues) showed particularly strong results, improving not just breathlessness but also physical function and fatigue. Thoracic mobility exercises, which focus on improving how well your ribcage expands, can help your lungs fill more completely. Seven of the major rehabilitation studies used breathing exercises as a standalone intervention, and five of those were delivered remotely, making this an accessible option even if you can’t easily get to a clinic.
A practical starting point is diaphragmatic breathing (breathing deeply into your belly rather than shallowly into your chest) and pursed-lip breathing (inhaling through your nose and exhaling slowly through pursed lips). These techniques help counteract the air trapping that’s characteristic of post-COVID small airways disease. If your symptoms are significantly limiting your activity, ask about a formal pulmonary rehabilitation program, which combines supervised breathing work with graduated exercise.
What Recovery Looks Like
Recovery from post-COVID respiratory symptoms is slow. At 30 days after initial symptoms, nearly all patients (about 97% of those with asthma) still report some symptoms. By 60 days, that number drops to around 84%, and at 90 days, roughly 75% still have lingering issues. More than half of patients, with or without pre-existing asthma, continue to report lower respiratory symptoms at the 3-month mark. About 9.5% of asthma patients meet criteria for post-COVID syndrome at 3 months.
The pace of improvement matters more than the starting point. If your symptoms are gradually getting better, even slowly, that’s a positive trajectory. If they’re stable or worsening after several months despite treatment, that warrants a reassessment, potentially including repeat pulmonary function testing to check for changes in lung capacity or gas transfer. Having asthma before COVID doesn’t appear to make your respiratory recovery significantly slower or faster than someone without it, which is somewhat reassuring if you’re comparing yourself to others who got sick.
The current evidence doesn’t yet give clear answers about very long-term outcomes, including whether post-COVID asthma becomes a permanent condition or eventually resolves for most people. What is clear is that active treatment with inhaled corticosteroids, consistent breathing exercises, and gradual return to physical activity gives you the best chance of regaining function.