Symptoms A-Z

Clear Runny Nose Symptoms, Causes & Common Questions

A runny nose with clear discharge can be caused from a viral or bacterial infection, allergies, or in very rare cases, a sign of a severe brain injury. Fortunately, the most common cause of a runny nose like water is the common cold, or sinusitis. Read below for more information causes and treatment options.

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Contents

  1. Symptoms
  2. Causes
  3. 6 Possible Clear Runny Nose Conditions
  4. Treatments and Relief
  5. Questions Your Doctor May Ask
  6. Statistics
  7. References

Clear Runny Nose Symptoms

A runny nose with clear mucus is a very common occurrence and is usually not serious. The clear discharge occurs most often when the nose is trying to expel irritating substances due to an allergy or an illness — it's actually a normal process [1]. A "runny nose" of any kind is also called rhinorrhea.

However, in rare cases, this clear nasal discharge can be a sign of a cerebrospinal fluid (CSF) leak through a break in the lining of the brain [2]. This would constitute a medical emergency.

Common characteristics and accompanying symptoms of a clear runny nose are

The following characteristics will likely be experienced with a viral infection or an allergy:

  • Clear, watery discharge that is usually from both nostrils
  • Low-grade fever: This is a fever of 100 degrees Fahrenheit or less, or there may be no fever at all.
  • Sudden-onset: Symptoms may begin within a day.
  • Nasal congestion
  • Coughing
  • Watery eyes
  • Sneezing
  • An itchy feeling in your nose, throat, and eyes

With a foreign body in the nose

Symptoms may differ slightly if this is the cause.

  • Clear, watery discharge only from one nostril
  • Traces of blood: This will occur from the same nostril as the discharge.
  • A foul odor from the nose
  • A whistling sound as breath passes through the nose

With a cerebrospinal fluid leak

The following symptoms are likely with a CSF leak.

  • Clear, watery discharge that is often from one nostril only
  • Metallic or salty taste in the mouth [3]
  • Reduced sense of smell
  • Ringing in the ears
  • Postural headache: This a headache that comes and goes depending on whether you are sitting up, lying down, etc.

Duration

You can expect a clear runny nose to last a certain amount of time depending on the cause.

  • A common cold: This will likely last for about 10 to 14 days.
  • Allergies: Allergies last as long as the allergen is present.
  • CSF leak: A cerebrospinal fluid leak must be treated right away.

Who is most often affected by clear runny nose symptoms

The following people are more likely to experience a clear runny nose.

  • Anyone who suffers from a common cold or from seasonal allergies: You are quite likely to have a clear runny nose at some point.
  • Anyone with a head injury or other impact to the brain: A traumatic CSF leak can happen to anyone who has had a head injury, an epidural steroid injection for pain management, or brain surgery.
  • If you are over 30 or have certain conditions: A spontaneous CSF leak most often occurs in someone over the age of 30 who also has a malformation of the skull, recurrent episodes of meningitis, or a brain tumor.

Are clear runny nose symptoms serious?

Again, a clear runny nose is rarely serious; however, the severity will be determined by figuring out the cause.

  • Not serious: A clear nasal discharge due to the common cold or an allergy is rarely ever serious.
  • Moderately serious: If there are symptoms of influenza along with the clear discharge, the person may need to see a medical provider for supportive care.
  • Serious: If there are symptoms of cerebrospinal fluid leak, that is a medical emergency and the person must have immediate emergency care.

Clear Runny Nose Causes

Many conditions can cause a clear runny nose as a symptom. We've listed several different causes here, in approximate order from most to least common:

Infection

Infectious causes of a clear, runny nose may include:

  • Viral infections: This is the most common cause of a clear runny nose [4].
  • Bacterial infections: These can also cause the clear discharge, but it will often turn to yellow or green after a few days.

Allergy

An allergic reaction to any sort of inhaled substance, such as pollen or dust, will cause a clear nasal discharge as the body tries to clear the substance out. An allergy will also cause irritated, itchy eyes and throat along with the clear runny nose but does not cause fever or a headache.

Foreign body or substance

A small object may be pushed into the nostril — as a curious child may do so intentionally — or something may become lodged in your nose on accident. Nasal spray may run back out if you do not allow it to drain into the back of your nose and sinuses.

Rare and unusual cause types

Less common causes of a clear, runny nose include the following.

  • Cerebrospinal fluid leak with trauma: In cases of severe head injury — even in a closed head injury, meaning there is no visible external wound — there can be a tear in the covering of the brain that allows cerebrospinal fluid to leak into the sinuses and out through the nose [5]. Brain, head, or neck surgery, or epidural steroid injection, can also result in a CSF leak.
  • CSF leaks without trauma: It's possible to have a CSF leak even when there has been no trauma. Spontaneous CSF leak is caused by a fistula — an abnormal opening — between the lining of the brain and the base of the skull. The reason for this formation is not entirely known and they are considered rare [6].

6 Possible Clear Runny Nose Conditions

The list below shows results from the use of our quiz by Buoy users who experienced clear runny nose. This list does not constitute medical advice and may not accurately represent what you have.

Common cold

The common cold is a viral infection of the upper respiratory tract, which includes the nose, mouth, sinuses, throat, and larynx. There are over 200 viruses that can cause upper respiratory infections, and usually the exact virus behind a cold is never known.

The common cold is, of course, very common...

Read more

Acute viral sinusitis

Acute viral sinusitis, also called viral rhinosinusitis or "sinus infection," occurs when viruses take hold and multiply in the sinus cavities of the face.

It is most often caused by the same viruses that cause the common cold and spreads the same way, through an infected person's coughing or sneezing.

Because children have small, underdeveloped sinuses, this illness is far more common in adults.

Symptoms include clear nasal discharge (not greenish or yellowish,) fever, and pain if facial sinuses are pressed.

If there is rash, severe fatigue, or neurologic symptoms (seizures, loss of sensation, weakness, or partial paralysis,) see a medical provider to rule out more serious conditions.

Diagnosis can usually be made through history and examination alone.

Antibiotics only work against bacteria and cannot help against a viral illness. Therefore, treatment consists of rest, fluids, and fever/pain reducers such as ibuprofen. (Do not give aspirin to children.) Symptoms of viral sinusitis last for about seven to ten days. As with the common cold, the best prevention is frequent and thorough handwashing.

Rarity: Common

Top Symptoms: headache, cough, sinusitis symptoms, sore throat, congestion

Symptoms that always occur with acute viral sinusitis: sinusitis symptoms

Symptoms that never occur with acute viral sinusitis: being severely ill

Urgency: Self-treatment

New-onset seasonal allergies

New-onset seasonal allergies, also called adult-onset seasonal allergies, are sensitivities to pollen, mold, and other irritants that cause nasal congestion, runny nose, sneezing, itchy eyes, and sore throat.

Seasonal allergies commonly begin in childhood but can start at any age, especially among those with a family history. Moving to a different geographic location may trigger the allergy in someone with a genetic predisposition. Anyone with asthma is more likely to experience adult-onset seasonal allergies.

Sometimes the symptoms are actually from "pregnancy rhinitis" – nasal congestion and sneezing due to the effects of pregnancy hormones on the nasal tissue.

A new-onset allergy is often thought to be a cold, but a cold will clear up without treatment. Allergies persist, never getting better or worse, and can interfere with quality of life.

Diagnosis is made by an allergist, who will use skin tests and blood tests.

There is no cure for seasonal allergies but the symptoms can be managed for greater comfort and relief. Antihistamines, corticosteroid nasal sprays, and immunotherapy or "allergy shots" can be very effective.

Rarity: Common

Top Symptoms: sore throat, congestion, cough with dry or watery sputum, mucous dripping in the back of the throat, fatigue

Symptoms that never occur with new-onset seasonal allergies: fever, yellow-green runny nose, chills, muscle aches

Urgency: Self-treatment

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Chronic allergies

Allergies are an overreaction by the immune system to something that does not bother most other people. Many people who have allergies are sensitive to pollen, but other things such as dust mites, animal dander, cockroaches, and mold can also cause a reaction.

Rarity: Common

Top Symptoms: fatigue, irritability, trouble sleeping, runny nose, congestion

Symptoms that never occur with chronic allergies: fever, yellow-green runny nose, chills, muscle aches

Urgency: Self-treatment

Non-allergic rhinitis

Rhinitis simply means "inflammation of the nose." When it is caused by something other than allergies, it is called vasomotor rhinitis. "Vasomotor" simply refers to the constriction or dilation of blood vessels.

Different substances can trigger the vasomotor reaction, even though it is not an allergic reaction. Common causes are certain medications; air pollution; and chronic medical conditions.

Symptoms include runny nose, sneezing, congestion, and postnasal drip. Since no allergy is involved, there will not be the scratchy throat or itchy eyes and nose of allergic rhinitis.

A medical provider should be seen for ongoing symptoms, since they can interfere with quality of life. Also, using over-the-counter medications meant for allergic rhinitis will not help in a case of vasomotor rhinitis.

Diagnosis is made through patient history, physical examination, and allergy tests, in order to rule out allergies as a cause of the symptoms.

Treatment involves using the appropriate medications to ease the symptoms, and avoiding any triggers as much as possible.

Rarity: Common

Top Symptoms: congestion, mucous dripping in the back of the throat, runny nose, frequent sneezing, eye itch

Symptoms that never occur with non-allergic rhinitis: fever, sinus pain, facial fullness or pressure

Urgency: Self-treatment

Chronic sinusitis

Chronic sinusitis is also called chronic rhinosinusitis. It is an inflammation of the sinuses, or open spaces of the skull, above and below the eyes. "Chronic," in this case, means the condition has persisted for weeks in spite of treatment and has probably followed several cases of acute sinusitis.

The condition may start with a viral, bacterial, or fungal upper respiratory tract infection; asthma; allergies; or nasal polyps.

Symptoms include facial pain, swelling, and nasal congestion. There is often fatigue; greenish or yellowish nasal discharge; loss of sense of smell; ear pain; cough; and sore throat.

Chronic sinusitis should be seen by a medical provider, especially if symptoms worsen. The condition interferes with quality of life and the ongoing infection can become serious.

Diagnosis is made through patient history; physical examination; sinus cultures; skin tests for allergies; CT scan of the head; and nasal endoscopy (rhinoscopy.)

Treatment may involve saline nasal irrigation; nasal spray corticosteroids; oral corticosteroids; antibiotics for bacterial infection; immunotherapy for allergies; and, in some cases, surgery to remove polyps or other obstructions.

Rarity: Common

Top Symptoms: fatigue, headache, trouble sleeping, congestion, runny nose

Symptoms that always occur with chronic sinusitis: chronic sinusitis symptoms

Urgency: Primary care doctor

Clear Runny Nose Treatments and Relief

At-home treatments

You can try the following clear runny nose remedies at home.

  • Drink extra fluids
  • Use a humidifier: This will help keep the mucus thin rather than thick and sticky, so that it can drain out and help take the illness-causing agents with it.
  • Use saline nasal sprays for soothing moisture: This may provide a little extra comfort.
  • Over-the-counter antihistamines: These may be helpful for allergies, though some can cause drowsiness.

When to see a doctor

You should schedule an appointment for the following.

  • Nasal drainage that becomes thick, yellow to green, and/or foul smelling: This is especially important if there are other symptoms such as headache, sore throat, or fever.
  • Ear pain, sinus pain, sore throat, and/or persistent cough: This is especially important if you also have clear mucus discharge from the nose. The mucus may be too thick to drain properly and causing irritation, which can lead to further infection [7].

When it is an emergency

Seek immediate clear runny nose treatment in the emergency room or call 911 if you have a severe headache with clear drainage from one nostril, especially if this follows a head injury, head surgery, or epidural steroid injection. The drainage may or may not show signs of blood.

Prevention

While not all causes of a clear runny nose can be prevented, there are some measures you can take to keep yourself in good health.

  • Wash your hands frequently: This is especially important before preparing meals.
  • Avoid touching your nose, eyes, or face: If you must, make sure to wash your hands before and after to limit the spread of germs.
  • Find an allergy medicine that works for you: If you suffer from seasonal allergies, there may be an effective over-the-counter option available or you can consult your physician.
  • Get plenty of sleep: You should aim for 7-9 hours of sleep each night. Try to get up and go to bed at the same time each day.
  • Eat a balanced diet to ensure proper nutrition: Make sure to eat plenty of fruits and vegetables, lean meats and other proteins, healthy fats, and whole grains.

Questions Your Doctor May Ask About Clear Runny Nose

To diagnose this condition, your doctor would likely ask the following questions:

  • Do you have a stuffy nose?
  • Any fever today or during the last week?
  • Do you have a cough?
  • Are you experiencing a headache?

The above questions are also covered by our A.I. Health Assistant.

If you've answered yes to one or more of these questions

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Clear Runny Nose Symptom Checker Statistics

People who have experienced clear runny nose have also experienced:

  • 11% Cough
  • 6% Sore Throat
  • 6% Frequent Sneezing

People who have experienced clear runny nose were most often matched with:

  • 33% Common Cold
  • 33% Acute Viral Sinusitis
  • 33% New-Onset Seasonal Allergies

People who have experienced clear runny nose had symptoms persist for:

  • 46% Less than a week
  • 21% Less than a day
  • 12% One to two weeks

Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

Clear Runny Nose Symptom Checker

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References

  1. Knight A. The differential diagnosis of rhinorrhea. J Allergy Clin Immunol. 1995;95(5):1080-1083. JACI Online Link
  2. Mathias T, Levy J, Fatakia A, McCoul ED. Contemporary approach to the diagnosis and management of cerebrospinal fluid rhinorrhea. Ochsner J. 2016;16(2):136-142. NCBI Link.
  3. Cerebrospinal fluid leak. Cedars-Sinai. Cedars-Sinai Link
  4. Common colds: Protect yourself and others. Centers for Disease Control and Prevention. Updated February 12, 2018. CDC Link.
  5. Oh JW, Kim SH, Whang K. Traumatic cerebrospinal fluid leak: Diagnosis and management. Korean J Neurotrauma. 2017;13(2):63-7. NCBI Link
  6. Hayashi Y, Iwato M, Kita D, Fukui I. Spontaneous cerebrospinal fluid leakage through fistulas at the clivus repaired with endoscopic endonasal approach. Surg Neurol Int. 2015;6:106. NCBI Link
  7. Sinus infection. American College of Allergy, Asthma & Immunology. ACAAI Link

Disclaimer: The article does not replace an evaluation by a physician. Information on this page is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes.