A blocked nose usually isn’t caused by mucus alone. The main culprit is swollen tissue inside the nasal passages. When something irritates the lining of your nose, whether a cold virus, allergens, or dry air, the tissue becomes inflamed and the blood vessels expand, narrowing the airway. Your immune system then floods the area with mucus to flush out the irritant, and the combination of swelling and mucus makes breathing through your nose difficult or impossible. Effective relief targets both problems.
Saline Rinse: The Fastest Drug-Free Option
Flushing your nasal passages with salt water physically washes out mucus, allergens, and irritants. You can use a squeeze bottle, neti pot, or bulb syringe. Mix about a quarter teaspoon of non-iodized salt with 8 ounces of safe water, and add a small pinch of baking soda to reduce stinging.
Water safety matters here. The CDC recommends using water labeled “distilled” or “sterile.” Tap water works if you boil it at a rolling boil for one minute first (three minutes above 6,500 feet elevation), then let it cool completely before use. Never rinse with untreated tap water, as it can contain organisms that are harmless to swallow but dangerous when introduced directly into nasal passages.
Most people notice relief within minutes. Rinsing once or twice a day is generally enough during a cold or allergy flare. Saline sprays from the pharmacy offer a gentler, more convenient alternative if the full rinse feels uncomfortable.
Steam and Humidity
Warm, moist air loosens mucus and soothes irritated nasal tissue. A hot shower with the bathroom door closed is the simplest approach. You can also lean over a bowl of hot water with a towel draped over your head and breathe through your nose for five to ten minutes. Adding menthol or eucalyptus oil can enhance the sensation of openness, though these don’t reduce the underlying swelling.
If your home air is dry, especially in winter with central heating, a humidifier helps keep nasal passages from drying out and getting more irritated. The CDC and EPA recommend keeping indoor humidity between 40 and 50 percent. Higher than that encourages mold and dust mites, which can make congestion worse. Clean your humidifier regularly to prevent bacteria from growing in the water tank.
Decongestant Sprays: Effective but Time-Limited
Topical decongestant sprays containing oxymetazoline or xylometazoline shrink swollen blood vessels in the nose and can open your airway within minutes. They’re some of the most effective short-term options available over the counter.
The catch is that you cannot use them for more than three consecutive days. Beyond that, the nasal tissue starts to depend on the spray, and when it wears off, the swelling rebounds worse than before. This rebound congestion can become a cycle that’s hard to break. Treat these sprays as a short bridge, not a daily habit.
Oral Decongestants: Check the Label
If you prefer a pill, look for pseudoephedrine (sold behind the pharmacy counter in many countries). It narrows blood vessels throughout the body, reducing nasal swelling from the inside. It can raise blood pressure and heart rate, so it’s not suitable for everyone, particularly people with hypertension or heart conditions.
Many cold medicines on the shelf contain oral phenylephrine instead. In 2023, the FDA proposed removing oral phenylephrine from over-the-counter cold products after an advisory panel unanimously concluded it does not work as a nasal decongestant at standard doses. Products containing it are still being sold while the proposal moves through the regulatory process, but the evidence strongly suggests you’d be paying for an inactive ingredient. The FDA’s concern applies only to the oral form; phenylephrine nasal sprays still work.
Steroid Nasal Sprays for Ongoing Congestion
If your blocked nose is driven by allergies or lasts more than a week, a corticosteroid nasal spray is more appropriate than decongestants. These sprays reduce inflammation directly at the source without the rebound risk. Several are available over the counter.
They don’t provide instant relief. You may notice some improvement within a day or two, but full effect can take up to two weeks of consistent daily use. For nasal polyps, improvement may not appear for four to six weeks. The key is using them regularly rather than only when symptoms flare.
Positioning and Nighttime Relief
Congestion often feels worse at night because lying flat allows blood to pool in the nasal vessels, increasing swelling. Elevating your head helps gravity drain fluid away from the nasal passages. You can stack an extra pillow, use a firm wedge pillow, or place risers under the head of your bed. If you’re not sure whether a wedge pillow is worth buying, try propping yourself up with a couple of regular pillows for a few nights first to see if it helps.
Sleeping on your side can also shift congestion. If one nostril is more blocked, try lying on the opposite side. Applying a warm, damp cloth across your nose and forehead before bed can offer a few minutes of relief as you fall asleep.
What Works During Pregnancy
Pregnancy itself can cause nasal congestion due to increased blood flow and hormonal changes, and it limits which treatments are safe. Saline sprays and rinses are the safest first option since they contain no medication and aren’t absorbed into the body. Steam inhalation and humidifiers are equally safe.
If saline alone isn’t enough, certain corticosteroid nasal sprays (such as budesonide) are considered lower risk during pregnancy when used at the lowest effective dose. Decongestant sprays should be a last resort, limited to three days or fewer. Oral decongestants like pseudoephedrine are generally avoided, especially in the first trimester. Any medication decision during pregnancy is best made with a doctor or pharmacist who knows your full history.
When Congestion Signals Something Bigger
A blocked nose from a cold typically clears within 7 to 10 days. Congestion lasting several weeks could point to allergies, a deviated septum, or chronic sinusitis, which is defined as sinus inflammation persisting 12 weeks or longer. Other signs that something more is going on include thick yellow or green discharge that doesn’t improve, facial pain or pressure around the cheeks and forehead, reduced sense of smell, or recurring sinus infections multiple times a year. In these cases, a healthcare provider can check for structural issues or underlying inflammation that simple home remedies won’t resolve.