What does it mean when you have a cold with yellow nasal discharge?

Yellow nasal discharge during a cold is typically a sign of bacterial infection, commonly resulting from an upper respiratory tract infection. Patients often exhibit catarrhal symptoms of the upper respiratory tract, such as rhinorrhea (runny nose), sneezing, and nasal congestion. So, what causes yellow nasal discharge during a cold? Below, we address this question.

What Causes Yellow Nasal Discharge During a Cold?

Yellow nasal discharge during a cold usually indicates a secondary bacterial infection. Large numbers of neutrophils migrate to the site of infection to phagocytose bacteria; upon reaching a certain threshold, these neutrophils undergo lysis, releasing pus that mixes with nasal mucus—resulting in yellowish discharge. Thus, yellow nasal discharge reflects bacterial infection of the nasal mucosa, and the yellow color arises from secretions produced by white blood cells after they have engulfed and destroyed bacteria. Treatment typically involves oral antibiotics such as cephalosporins or penicillins. Nasal discharge itself results from viral infection or exposure to allergens, which trigger vasodilation of nasal mucosal blood vessels and subsequent transudation of fluid into the nasal cavity, leading to excessive mucus production. Patients are advised to rest adequately, drink plenty of fluids, and maintain warmth. If symptoms worsen, prompt medical evaluation is recommended.

Knowledge Extension: How to Manage Rhinorrhea

1. Medication

For example, pseudoephedrine-dextromethorphan tablets may be taken to constrict nasal blood vessels, reduce nasal mucosal swelling, and decrease mucus secretion. Topical application of ephedrine solution (e.g., via nasal drops) can also shrink the nasal mucosa and reduce exudation. Note that rhinorrhea is not always caused by the common cold—it may stem from underlying conditions such as allergic rhinitis, chronic rhinitis, or sinusitis. Therefore, consulting a physician for appropriate diagnostic testing is advisable.

2. Nasal Massage

Assume a lateral decubitus position: if the left nostril is blocked, lie on the right side; if the right nostril is blocked, lie on the left side. Use the fingertips to gently massage the Yingxiang acupoints located on either side of the nostrils for 1–2 minutes, which may effectively alleviate rhinorrhea. Additionally, soak a towel in hot water and apply it as a warm compress over both ears for one minute—this may help eliminate pathogens and provide symptomatic relief for rhinorrhea.

3. Saline Nasal Irrigation

When experiencing rhinorrhea, prepare a mild saline solution to rinse the nasal passages. This method can help relieve nasal congestion and rhinorrhea to some extent. With consistent use over several days, rhinorrhea symptoms often improve significantly. Steam inhalation (facial steaming) may also aid in alleviating rhinorrhea.

The above provides an overview of the causes of yellow nasal discharge during a cold. We hope this information is helpful to you.