Sneezing, runny and blocked nose

Sneezing, a runny and blocked nose are common symptoms that may appear together or separately. The nose may produce a clear watery discharge, feel congested on one or both sides, itch, or trigger repeated sneezing. Symptoms may be temporary and related to a respiratory infection, or they may recur seasonally, appear after specific exposures, or persist throughout the year.

The combination is often associated with rhinitis, which means inflammation or irritation of the lining of the nose. Rhinitis may be allergic, non-allergic, infectious, medication-related, hormonal, or connected with another nasal or sinus condition. The timing, duration, type of nasal discharge, associated eye or breathing symptoms, and suspected triggers help determine the most appropriate diagnostic pathway.

A runny or blocked nose is usually not dangerous, but persistent congestion can affect sleep, concentration, exercise, smell, taste, and daily activities. Recurrent symptoms may also contribute to sinus pressure, ear problems, snoring, mouth breathing, or worsening asthma.

How the symptoms may appear

Symptoms may begin suddenly after exposure to an allergen or irritant, develop gradually during a respiratory infection, or remain present for weeks or months. Some people experience repeated bursts of sneezing, while others mainly have congestion or constant nasal drainage.

Common features include:

• repeated sneezing, especially in the morning or after exposure
• clear watery discharge from the nose
• a blocked or congested nose
• itching in the nose, throat, palate, or ears
• itchy, red, or watery eyes
• mucus draining down the back of the throat
• coughing, throat clearing, or hoarseness
• reduced sense of smell or taste
• facial pressure, headache, or a feeling of fullness in the ears
• snoring, mouth breathing, or disturbed sleep

The color of nasal mucus alone does not reliably distinguish a viral infection from a bacterial infection. Clear discharge is common with allergies, but may also occur at the beginning or end of a respiratory infection.

Common causes of sneezing, a runny and blocked nose

Allergic rhinitis

Allergic rhinitis develops when the immune system reacts to an inhaled allergen. Common triggers include pollen from trees, grasses and weeds, house dust mites, animal dander, mould spores, and occupational allergens.

Symptoms often begin within minutes of exposure and commonly include repeated sneezing, nasal itching, a clear runny nose, congestion, and itchy or watery eyes. Some people have symptoms only during a pollen season, while others react throughout the year to indoor allergens.

Seasonal symptoms may worsen outdoors, on dry or windy days, or during particular months. Symptoms caused by house dust mites may be stronger in the bedroom or in the morning. Animal-related symptoms may begin after direct contact or after entering a space where the animal has been present.

Common cold and other respiratory infections

Respiratory viruses can cause a runny or blocked nose, sneezing, sore throat, cough, headache, mild body aches, fatigue, and sometimes fever. Symptoms usually develop over a short period and then gradually improve.

A viral infection is more likely than allergy when nasal symptoms occur with sore throat, general illness, fever, muscle aches, or contact with people who have similar symptoms. Allergy more commonly causes itching of the nose and eyes and does not usually cause fever.

Different respiratory infections can produce similar symptoms. Testing or medical advice may be appropriate when the result would affect treatment, isolation, work, travel, or protection of vulnerable people.

Non-allergic rhinitis

Non-allergic rhinitis causes congestion, runny nose, sneezing, or postnasal drainage without an identifiable allergic trigger. Symptoms may be provoked by smoke, perfume, cleaning products, paint fumes, air pollution, changes in temperature or humidity, cold air, exercise, alcohol, or spicy food.

Hormonal changes during pregnancy, puberty, or menopause may affect the nasal lining. Some medicines and medical conditions, including an underactive thyroid, can also contribute.

Unlike allergic rhinitis, non-allergic rhinitis usually causes less itching of the eyes and nose. Allergy testing may be normal even though symptoms are significant.

Overuse of decongestant nasal sprays

Decongestant sprays can provide short-term relief by narrowing blood vessels in the nose. When used for longer than recommended, they may cause rebound congestion, meaning the nose becomes increasingly blocked as the effect wears off.

This condition can lead to repeated spray use and persistent congestion. The method of stopping the spray and selecting alternative treatment should be discussed with a doctor or pharmacist.

Sinus inflammation and infection

Inflammation of the sinuses may cause nasal blockage, facial pressure, reduced smell, headache, cough, and nasal discharge. It often follows a respiratory infection but may also be associated with allergy, nasal polyps, or structural narrowing.

Symptoms that persist, worsen after initial improvement, or include marked facial pain and fever may require medical evaluation. Long-lasting sinus symptoms should not automatically be treated as a bacterial infection without assessment.

Nasal polyps and structural problems

A deviated nasal septum, enlarged nasal tissues, nasal polyps, previous injury, or another structural problem may cause persistent congestion, reduced airflow, snoring, mouth breathing, recurrent sinus symptoms, or reduced smell.

Structural causes are more likely when blockage is consistently worse on one side, does not vary with seasons or exposures, or responds poorly to usual rhinitis treatment.

Food and immediate allergic reactions

Spicy food can cause a temporary runny nose through a non-allergic reflex. Isolated long-term nasal symptoms are rarely explained by food allergy.

Food allergy is more likely when symptoms begin rapidly after a particular food and include hives, swelling, vomiting, wheezing, coughing, or breathing difficulty. Broad food allergy testing is not usually appropriate for isolated sneezing or nasal congestion without a consistent immediate reaction.

Symptoms that may occur together

Associated symptoms help distinguish allergy, infection, sinus disease, asthma, and other conditions. Important details include:

• itchy, red, or watery eyes
• itching of the nose, throat, palate, or ears
• sore throat, cough, fever, or body aches
• wheezing, chest tightness, or shortness of breath
• facial pain, tooth pain, headache, or reduced smell
• ear pressure, hearing changes, or recurrent ear infections
• snoring, poor sleep, daytime tiredness, or mouth breathing
• hives, facial swelling, vomiting, or another rapid allergic symptom
• nosebleeds or persistent discharge from only one side

When emergency medical care is needed

Seek emergency medical care if nasal symptoms occur with swelling of the lips, tongue, mouth, face, or throat, difficulty breathing, wheezing, difficulty swallowing, dizziness, fainting, confusion, or rapid deterioration. These symptoms may indicate a severe allergic reaction.

Urgent assessment is also required for severe breathing difficulty, swelling around the eyes with visual changes, a severe headache with neck stiffness or confusion, or a continuous clear watery discharge from one side of the nose after a head injury.

When to arrange a medical assessment

Arrange a medical assessment when symptoms:

• persist for several weeks or frequently return
• significantly affect sleep, work, school, or daily activities
• are associated with wheezing, asthma, or breathing difficulty
• occur with persistent facial pain, reduced smell, or recurrent sinus problems
• remain mainly on one side of the nose
• include repeated nosebleeds or blood-stained discharge
• do not improve with appropriate initial measures
• appear to be connected with the workplace or a specific exposure
• occur in a young child with feeding, sleep, or breathing problems

Persistent unilateral blockage, bleeding, or an unexplained change in smell should not be assumed to be a simple allergy or cold.

How these symptoms are usually diagnosed

Symptom and exposure history

The assessment begins with the timing and pattern of symptoms. Important information includes whether symptoms are seasonal or year-round, where they occur, how quickly they begin after exposure, and whether they improve away from home, work, animals, dust, or pollen.

A doctor may also ask about respiratory infections, asthma, eczema, eye symptoms, medication, nasal sprays, occupational exposure, smoking, sleep, and previous nasal or sinus surgery.

Examination of the nose and airways

The nose may be examined for swelling, discharge, polyps, crusting, bleeding, or structural obstruction. The throat, ears, eyes, sinuses, and lungs may also be assessed depending on the associated symptoms.

An ear, nose and throat specialist may use nasal endoscopy to examine areas that cannot be seen during a routine examination.

Allergy testing

Skin prick testing or blood testing for allergen-specific IgE may be used when allergic rhinitis is suspected and identifying the trigger would influence avoidance measures or treatment.

Testing should be selected according to the history. A positive result shows sensitization but does not automatically prove that the allergen is causing the symptoms. The result must match the timing and pattern of exposure.

Testing may include relevant inhaled allergens such as pollens, house dust mites, animal dander, or moulds. Broad panels without a clear clinical question can produce results that are difficult to interpret.

Other investigations

Imaging is not routinely required for uncomplicated rhinitis. A sinus scan may be considered for persistent sinus symptoms, suspected complications, structural problems, or planning of specialist treatment.

Additional assessment may include asthma testing, nasal sampling, evaluation of smell, or other investigations when the history suggests another condition.

What the next step may involve

The next step depends on whether the likely cause is allergic, infectious, non-allergic, medication-related, or structural. Short-lived symptoms during a respiratory infection may mainly require symptom management and monitoring.

For confirmed or strongly suspected allergic rhinitis, management may include reducing exposure to relevant allergens, antihistamines, corticosteroid nasal sprays, saline rinsing, or other medication. Nasal sprays must be used with correct technique and consistently enough to assess their effect.

Saline irrigation may help remove mucus and allergens. Only sterile or distilled water, or water that has been boiled and allowed to cool, should be used for nasal rinsing devices.

Decongestant sprays should be used only for the recommended short period because prolonged use can worsen congestion. Oral decongestants are not suitable for everyone, particularly people with certain heart, blood pressure, prostate, thyroid, or eye conditions.

Allergen immunotherapy may be considered for selected people with confirmed allergic rhinitis whose symptoms remain significant despite appropriate treatment and allergen avoidance. It requires specialist assessment and a clearly identified relevant allergen.

Persistent structural obstruction, nasal polyps, recurrent sinus disease, or unilateral symptoms may require an ear, nose and throat consultation.

What to prepare before a medical appointment

Before an appointment or ZagrebMed inquiry, prepare information about:

• when the symptoms started and how long they last
• whether they are seasonal, year-round, or linked to a specific place
• possible exposure to pollen, dust, mould, animals, smoke, perfume, or chemicals
• itching of the nose or eyes, watery eyes, cough, fever, or sore throat
• wheezing, chest tightness, asthma, or breathing difficulty
• facial pain, reduced smell, ear symptoms, snoring, or sleep disturbance
• whether one or both sides of the nose are affected
• medicines, nasal sprays, supplements, and treatments already used
• previous allergy tests, sinus imaging, or specialist reports
• whether symptoms improve away from home or work

If sneezing, nasal discharge, or congestion persists or repeatedly returns, you can send ZagrebMed a description of the pattern and any available medical documentation. ZagrebMed can help connect the symptoms with an allergy assessment, laboratory testing, an ear, nose and throat consultation, or another appropriate diagnostic pathway in Zagreb.