What causes thick mucus drainage in throat?

There are several potential causes of thick mucus drainage in the throat. Some of the most common include:

* Allergies: Allergies to pollen, dust, pet dander, and other substances can cause inflammation and increased mucus production in the nose and throat.

* Sinusitis: Sinusitis is an inflammation of the sinuses, which are located behind the forehead, nose, and cheekbones. Sinusitis can cause thick mucus to drain down the back of the throat.

* Common cold: The common cold is a viral infection of the nose and throat that can cause thick mucus drainage.

* Flu: The flu is a respiratory illness that can cause thick mucus drainage, along with other symptoms such as fever, chills, and muscle aches.

* Bronchitis: Bronchitis is an inflammation of the bronchial tubes, which are the airways that carry air to the lungs. Bronchitis can cause thick mucus drainage, as well as coughing, shortness of breath, and wheezing.

* Pneumonia: Pneumonia is an infection of the lungs that can cause thick mucus drainage, as well as fever, chills, and shortness of breath.

* Other medical conditions: Certain other medical conditions, such as cystic fibrosis, gastroesophageal reflux disease (GERD), and asthma, can also cause thick mucus drainage.

If you have thick mucus drainage that is accompanied by other symptoms such as fever, chills, or shortness of breath, it is important to see a doctor to rule out any serious underlying medical conditions.