Nasal congestion: Causes and how to clear a stuffy nose 

What is nasal congestion and what causes it?

Nasal congestion, commonly known as a blocked or stuffy nose, is the swelling of tissues and blood vessels inside your nasal passage, typically caused by viral infections, allergies, or irritants. This inflammatory immune response produces excess mucus and physically narrows your airway, making it harder to breathe comfortably.

How a nose becomes blocked

When your nose encounters an irritant, allergen, or virus, your immune system mounts a defence. This triggers a strong inflammatory response. The blood vessels within the delicate lining of your nose expand rapidly. This leads to swollen tissues that physically narrow your airway, making it harder for air to pass through.

At the same time, your nasal glands produce extra mucus. This sticky fluid is designed to trap the invading particles, such as viruses or dust, and flush them out of your system. The combination of swollen internal tissues and thick, slow-moving mucus creates that familiar, uncomfortable blocked feeling.

Young man pinching the bridge of his nose against a blue background, appearing to have a headache

 Possible Causes

Detail

Allergies 

Exposure to triggers like pollen, dust mites, or pet dander can lead to congestion. 

Environmental irritants 

Smoke, fumes, or even extreme weather conditions can cause a stuffy nose. 

Anatomical abnormalities 

Conditions such as nasal polyps (painless growths in the nose) or a deviated septum (a crooked nasal partition) can lead to chronic congestion. 

Hormonal changes 

Pregnancy or hormonal imbalances can sometimes cause nasal congestion. 

Certain medications 

Some medicines, including beta-blockers, may cause nasal congestion as a side effect. 

Overuse of decongestant sprays 

Prolonged use of nasal sprays can worsen congestion over time. 

Is it a cold, allergies, or a sinus infection?

To determine if your congestion is a cold, allergies, or a sinus infection, you should evaluate accompanying symptoms such as fever, facial pain, or itchy eyes. Working out the exact cause of your blocked nose helps you find the most effective and appropriate relief.

Key differences in symptoms

A common cold usually develops gradually over a few days. It often brings a sore throat, mild body aches, and fatigue. The mucus usually starts clear and may turn thick and discoloured as the immune system fights the virus.

If you have allergies, the congestion often appearsafter exposure to an allergen. This type of congestion often coincides with other symptoms such as itchy eyes, a tickly throat, and frequent sneezing, and the mucus typically remains clear and watery.

Sinusitis tends to cause a distinct feeling of pressure or pain in your face, particularly when you lean forward. It frequently develops after a recent cold when mucus becomes trapped in the sinus cavities.

Woman pinching the bridge of her nose with eyes closed, appearing to have a headache

Symptom checker

Use this simple comparison to help identify the likely cause of your symptoms.

Symptom

Common Cold

Allergic Rhinitis

Sinusitis

Onset of symptoms

Gradual

Afer exposure to an allergen

Often follows a cold

Duration

7 to 10 days

Lasts as long as exposure

Can last 2 to 3 weeks

Type of mucus

Starts clear, turns yellow or green

Clear and watery

Can be thick yellow or green

Sneezing

Occasional or Frequent

Frequent

Rare

Itchy eyes/nose

Rare

Very common

Rare

Facial pain/pressure

Mild or absent

Absent

Common and moderate to severe

Fever/body aches

Sometimes

Absent

Sometimes

 

Duration of symptoms

A typical cold resolves within 1-2 weeks, and the congestion should ease naturally as you recover. Allergic rhinitis will persist for as long as you are exposed to the trigger, which might be several months during the spring and summer pollen season if you have Hay Fever. The NHS advises that sinusitis often improves within two to three weeks without the need for antibiotics. Tracking your timeline helps you understand when a symptom is dragging on and might need medical attention.

How can I treat my nasal congestion at home?

If your nasal congestion is recent and not severe, you can manage your symptoms at home with simple remedies and non-prescription products from your pharmacy. Many people look specifically for a nasal congestion treatment, nasal congestion medication, or nasal congestion medicine, while others prefer to start with natural remedies nasal congestion — such as steam inhalation or saline rinses — before trying other nasal congestion remedies.

Here are some tips to ease a blocked nose:

 Tip

How

Stay hydrated 

Drink plenty of fluids to keep your nasal passages moist. 

Inhale steam 

Place your face over a bowl of hot water and breathe in the steam. 

Use a saltwater solution 

Saline sprays or rinses can help clear your nasal passages. 

Apply a warm compress 

Place a warm flannel over your nose and cheeks to reduce discomfort. 

How to choose the right over-the-counter treatment

You can choose the right over-the-counter treatment for your congestion by matching your specific symptoms with the correct saline, decongestant, or corticosteroid nasal spray. Walking down the pharmacy aisle can be overwhelming when you have a blocked nose, but understanding the different types of treatments helps you select the safest option.

Comparing nasal sprays

Saline sprays use a simple, drug-free saltwater solution to gently wash out the nose. Decongestant sprays contain active medication that rapidly shrinks swollen blood vessels inside the nasal passages.

Corticosteroid sprays contain anti-inflammatory medicine to gradually reduce inflammation over a longer period.

Feature

Saline Spray

Decongestant Spray

Corticosteroid Spray

How it works

Moistens the nasal lining and helps clear secretions; high-volume irrigation washes out mucus and particles

Causes local vasoconstriction, rapidly reducing mucosal swelling

Reduces nasal inflammation and associated congestion, discharge and sneezing

Best for

Symptomatic relief of dryness, thick secretions or mild congestion; may be used regularly

Short-term relief of troublesome nasal blockage, including during a cold

Allergic rhinitis; persistent/non-allergic rhinitis; selected chronic rhinosinusitis or nasal-polyps indications

How quickly it works

May feel helpful immediately

Usually within minutes

Some benefit may occur within hours; noticeable benefit usually takes several days, maximum effect may take 1-2 weeks.

How long you can use it

Generally suitable for regular use if used hygienically

Short course only—usually no more than 7 days; follow the product instructions

Regular use for the duration advised for the indication, with review if prolonged treatment is needed

The risk of rebound congestion

Decongestant sprays provide excellent short-term relief, but they must be used for no longer than 7 days. If you use topical decongestant sprays for too long, they can cause a condition called rebound congestion, medically known as rhinitis medicamentosa. This means your nose becomes blocked again as soon as the medication wears off, leading to a cycle of dependence.

 

Antihistamine and decongestant tablets

If your congestion is caused by hay fever, dust mites, or a pet allergy, antihistamine tablets are usually the best choice.

Oral decongestant tablets, such as those containing pseudoephedrine, work systemically through your bloodstream. While they do not carry the same risk of nasal rebound congestion as sprays, they can cause systemic side effects like a fast heart rate or difficulty sleeping. They are not suitable for everyone, so check with a pharmacist or online GP first if you have high blood pressure or heart or kidney problems, or take other regular medicines. You can read more in our guide to managing allergies and hay fever.

Managing nasal congestion in children and during pregnancy

Managing nasal congestion in children and during pregnancy requires safe, drug-free methods like saline drops and steam, because many standard over-the-counter medications are not suitable. Treating a blocked nose requires extra care for these groups to ensure their safety and comfort.

Helping a congested baby or toddler

Babies breathe mainly through their noses, so congestion can make feeding and sleeping very distressing for them. It is important to know that many over-the-counter cough and cold medicines are unsafe for young children.

Instead, focus on safe, non-medicinal methods. If required, saline nasal drops are gentle and can help loosen dried mucus in tiny nasal passages. You can use a special nasal aspirator, often called a bulb syringe, to gently suck out the softened mucus before a feed. Keeping the air in their room humid with a humidifier can also help them breathe more easily at night.

When to get urgent help

Call 999 or go to A&E if: Your baby is struggling to breathe, grunting with effort, or turning blue or pale.

Call 111 if: Your baby is under three months old with a temperature of 38C or higher, or is refusing feeds and has fewer wet nappies.

 

Managing a blocked nose while pregnant

It is very common to experience nasal congestion during pregnancy. Hormonal changes, particularly increased oestrogen, and an overall increase in blood volume can cause the nasal linings to swell and produce more mucus.

The safest options for pregnant women are drug-free remedies. Saline sprays and rinses, steam inhalation, and sleeping with your head elevated are highly recommended. Some medicines are fine to use during pregnancy but others aren't, so it's best to check with a pharmacist, midwife or GP before taking anything, including over-the-counter remedies. Decongestant tablets and sprays are not recommended during pregnancy, but a pharmacist or GP can suggest suitable alternatives.

When should you see a doctor for nasal congestion?

Most blocked noses clear up on their own with rest, fluids and home care, usually within a week or two. However, certain symptoms can be a sign of something that needs medical assessment.

When to see a GP

  • Congestion that hasn't improved after 3 weeks, or keeps coming back
  • Congestion with severe or worsening pain or swelling in your face, especially if you had started to feel better and then got worse
  • A high temperature, or you feel very unwell
  • Congestion on only one side of your nose that doesn't go away, especially with blood-stained discharge, nosebleeds or facial numbness
  • A loss of smell that doesn't come back

Call 999 or go to A&E if you have:

  • A bulging eye, or pain when you move your eye
  • A stiff neck, or sensitivity to light
  • Confusion, drowsiness, a seizure or weakness
  • Difficulty breathing
man in red top holding nose

Frequently asked questions

Here are direct answers to some of the most frequently asked questions about nasal congestion.

Nasal congestion happens when the mucosa lining your nasal airway becomes swollen, a process doctors call mucosal oedema. Triggers can inflame the tissue around your turbinate (the ridged structures inside each nostril), which can obstruct or congest the space air normally flows through. It can affect one nostril (unilateral) or both (bilateral), and the blood vessels in the area can also dilate or vasodilatate, which is part of why the tissue swells.

Rhinitis simply means inflammation of the nose, and it comes in several forms. Allergic rhinitis is triggered by an allergen such as pollen or dust; non-allergic rhinitis (sometimes called vasomotor rhinitis) is not allergy-driven and can be linked to irritants, weather, or hormones; and occupational rhinitis develops from repeated exposure to substances at work. If the inflammation spreads to the sinuses as well, it is called rhinosinusitis, which can cause additional pressure and pain around the face.

Yes. A nasal polyp is a soft growth that can physically obstruct airflow, while a deviated septum is a structural difference in the wall between the nostrils that can make one side chronically blocked. Both tend to cause chronic rather than acute nasal inflammation, and unlike seasonal or perennial allergic causes linked to infectious triggers like a cold, they usually don’t resolve on their own — a doctor may need to assess whether an intranasal treatment, or in some cases minor surgery, is appropriate.

 Nasal congestion is worse at night because gravity causes mucus to pool in your nasal passages when you lie down. Additionally, blood flow changes when you recline, which increases the swelling in your delicate nasal tissues and makes the blockage feel much more pronounced. 

 Whether it is better to use a decongestant spray or a pill depends on your specific symptoms and sensitivity to side effects. Sprays offer fast, targeted relief but must only be used short-term to avoid rebound congestion, while pills provide longer-lasting relief but are more likely to cause systemic side effects. 

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