Postnasal Drip

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What is postnasal drip?

Postnasal drip develops when too much mucus collects at the back of the nose or in the throat. It usually creates the sensation of a “tickle” or itch in the throat that won’t go away. The mucus can be clear and watery or thick with a green, yellow, or white color.

The discomfort associated with postnasal drip usually leads to coughing, throat clearing, and watery eyes. In people with asthma, postnasal drip can make it difficult to breathe.

Causes of postnasal drip include allergies, the common cold, and the flu. It also sometimes accompanies other respiratory bacterial or viral infections or can be brought on by simple irritation, such as eating very spicy foods. Certain medications can cause postnasal drip, such as drugs containing estrogen.

Postnasal drip is not life threatening and usually resolves on its own. However, if the symptom lasts more than a few weeks, and if it is accompanied by foul-smelling discharge, fever, or difficulty breathing, you should contact a medical professional to identify the cause. Seek prompt medical care if you have facial lumps or a nonhealing sore in your nose, loose or painful upper teeth, a persistent or mucus-producing cough with sore throat, white patches and redness on your tongue or in your mouth, a persistent fever, or a feeling of something stuck in your throat that will not go away.


What other symptoms might occur with postnasal drip?

Postnasal drip may accompany other symptoms, depending on the underlying disorder.

Respiratory symptoms that may occur along with postnasal drip

Postnasal drip may accompany other symptoms affecting the respiratory system including:

Other symptoms that may occur along with postnasal drip

Postnasal drip may accompany symptoms related to other body systems. Such symptoms include:

  • Body aches
  • Enlarged lymph nodes in the throat
  • Facial or sinus pain, discomfort
  • Fatigue
  • Fever and chills
  • Heartburn

Symptoms that might indicate a serious condition

In some cases, postnasal drip may occur with other symptoms that might indicate a serious condition that should be immediately evaluated in an emergency setting. Seek immediate medical care (call 911) if you, or someone you are with, have postnasal drip along with other serious symptoms including:

  • Difficulty breathing
  • Difficulty swallowing
  • Fever
  • Lump in the throat
  • Lump or sore in the nose that does not heal
  • Pain in upper teeth
  • Sinus pain or headache
  • Sudden swelling of the tongue or throat

What causes postnasal drip?

Causes of postnasal drip include allergies, a cold, the flu, simple irritation, and an upper respiratory infection. Certain medications can also cause postnasal drip.

Respiratory system-related causes of postnasal drip

Postnasal drip can also be caused by specific respiratory diseases including:

Other causes of postnasal drip

Postnasal drip can also be caused by other factors that produce an increase in thin, clear mucus. These include:

  • Blood pressure medications
  • Cold temperatures
  • Eating spicy foods
  • Exposure to bright light for an extended period of time
  • Exposure to chemical fumes
  • Forced-air heating systems
  • Hormonal changes
  • Medications containing estrogen
  • Pregnancy

Serious or life-threatening causes of postnasal drip

In very rare cases, postnasal drip may be a symptom of a serious or life-threatening condition that should be immediately evaluated by a health care provider. These include cancers of the nose, pharynx, and paranasal sinuses.

Questions for diagnosing the cause of postnasal drip

To diagnose your condition, your doctor or licensed health care practitioner will ask you several questions related to your postnasal drip including:

  • How long have you had postnasal drip?

  • Have you had a cough? If you are coughing up mucus, what does it look like?

  • Are you having any difficulty breathing? Difficulty swallowing?

  • Have the glands in your neck felt swollen or tender to the touch?

  • Do you have any unexplained lumps in your face, mouth or throat?

  • Have you experienced any fever or chills?

  • Have you noticed any white patches or pus in your mouth or throat?

  • Have you been tested for allergies?

  • What medications are you taking?

  • Have you been exposed to any chemicals or fumes?

  • Do you have any other symptoms?

What are the potential complications of postnasal drip?

Complications from postnasal drip are relatively minor and depend on the cause. However, left untreated, postnasal drip can lead to serious complications. In the rare event that postnasal drip is caused by nasopharyngeal cancers, complications related to spread of the cancer might develop. Once the underlying cause is diagnosed, following the treatment plan that you and your health care professional design specifically for you will help reduce the risk of potential complications including:

  • Bad breath
  • Chronic nasal congestion
  • Cough
  • Difficulty breathing
  • Difficulty sleeping
  • Difficulty swallowing
  • Spread of cancer
  • Spread of infection
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Medical Reviewer: William C. Lloyd III, MD, FACS
Last Review Date: 2018 Dec 26
  1. Sore throat. Medline Plus, a service of the National Library of Medicine National Institutes of Health.
  2. Post-nasal drip. American Academy of Otolaryngology — Head and Neck Surgery.
  3. Kahan S, Miller R, Smith EG (Eds.). In A Page Signs & Symptoms, 2d ed. Philadelphia: Lippincott, Williams & Williams, 2009.
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