Laryngitis is almost always caused by a viral infection, vocal strain, or something irritating your throat. Your vocal folds (the two small bands of tissue in your voice box) become swollen, which changes how they vibrate and makes your voice hoarse, raspy, or sometimes nearly silent. If your symptoms have lasted less than three weeks, you’re dealing with acute laryngitis, which is the most common type and usually resolves on its own. Anything beyond three weeks is considered chronic and points to a different set of causes.
Viral Infections Are the Most Common Cause
The vast majority of acute laryngitis cases start with a virus. The same pathogens that give you a cold or the flu can inflame your vocal folds along the way. Common culprits include cold viruses, influenza and parainfluenza, RSV, COVID-19, and adenoviruses. You might notice your voice going hoarse a day or two into a respiratory illness, or sometimes the hoarseness is the main symptom while the rest of your cold feels mild.
Bacterial infections can also cause laryngitis, but this is rare. If your symptoms are unusually severe, you’re running a high fever, or things are getting worse rather than better after a week, a bacterial infection is worth considering. Most people with a standard viral case, though, will recover without any medication.
You May Have Strained Your Voice
If you don’t feel sick at all but your voice is shot, vocal overuse is the likely explanation. Shouting at a concert, cheering at a game, talking loudly for hours, or singing beyond your comfortable range can all inflame or even injure your vocal folds. Think of it as overworking a muscle to the point of swelling.
In more intense cases, vocal strain can rupture a tiny blood vessel in the vocal fold surface. This is called a vocal fold hemorrhage, and the hallmark is a sudden change in voice quality, sometimes mid-sentence. Singers, teachers, and public speakers are especially prone. Beyond the immediate hoarseness, you might notice voice fatigue, a feeling that your voice “gives out” by the end of the day, or a loss of your upper vocal range. Repeated episodes of strain can lead to more lasting changes like polyps or nodules on the vocal folds.
Acid Reflux Can Reach Your Voice Box
Stomach acid doesn’t always stop at your esophagus. When it travels all the way up to your throat and voice box, a condition called laryngopharyngeal reflux, it can cause chronic hoarseness that lingers for weeks or months. This is one of the most common reasons laryngitis becomes a recurring problem.
The damage happens two ways. Acid and digestive enzymes directly irritate the delicate tissue of the vocal folds, causing swelling, contact ulcers, or small growths called granulomas. At the same time, acid in the lower esophagus can trigger nerve reflexes that make you chronically clear your throat and cough, which further irritates the vocal folds. The tricky part is that many people with this type of reflux don’t have classic heartburn. Their main symptoms are hoarseness, a persistent throat-clearing habit, or a sensation of something stuck in their throat.
Smoke, Fumes, and Dry Air
Anything you breathe that irritates your airway can inflame your vocal folds. Cigarette smoke is the most obvious offender, both for smokers and those regularly exposed to secondhand smoke. But the list extends to workplace chemicals like isocyanates (found in paints and coatings), wood dust, flour dust, cleaning product fumes, and even prolonged exposure to very dry or dusty air. Gas stoves and poorly ventilated furnaces add indoor pollutants that can contribute over time.
Allergies play a role too. Postnasal drip from allergic reactions coats the throat and triggers coughing and throat clearing, both of which are hard on the vocal folds. If your hoarseness follows a seasonal pattern or gets worse around pets, dust, or mold, the underlying allergy may be driving it.
How Long Recovery Takes
Most acute laryngitis from a cold or a night of yelling clears up within one to two weeks. The most helpful thing you can do is rest your voice, but that doesn’t necessarily mean total silence. Speaking softly and limiting how much you talk is more practical and nearly as effective as going completely mute. Whispering, counterintuitively, can actually strain your vocal folds more than speaking at a low, relaxed volume.
For a previously healthy person who overdid it vocally, voice specialists generally recommend a few days to a week of relative voice rest, followed by one to four weeks of gradually returning to normal use. Staying well hydrated, breathing through your nose, and avoiding irritants like smoke all help your vocal folds heal. One voice specialist compared using your voice normally during laryngitis to hiking on blistered feet: it’s technically possible, but it slows healing and can make things worse.
If your voice hasn’t returned to normal after three weeks, something beyond a simple virus or vocal strain is likely going on. Reflux, ongoing irritant exposure, or a structural change on the vocal folds may need to be evaluated.
Signs That Something More Serious Is Happening
Simple laryngitis is uncomfortable but not dangerous. A few symptoms, however, warrant prompt attention. Hoarseness lasting more than two weeks without improvement, especially if you haven’t been sick, should be checked out. Difficulty swallowing, pain when swallowing, a lump in your neck, or coughing up blood are all red flags that point to conditions beyond routine laryngitis. Trouble breathing or a high-pitched, noisy breathing sound (stridor) requires immediate medical evaluation, as it can signal significant airway narrowing.
Persistent hoarseness is one of the earliest symptoms of laryngeal cancer, particularly in people who smoke or drink heavily. This doesn’t mean every hoarse voice is cancer. It means that hoarseness with no obvious cause that doesn’t resolve deserves a look with a small camera passed through the nose to examine the vocal folds directly. The exam is quick and gives a clear answer.