Causes of Common Cold with Runny Nose

Common cold refers to an upper respiratory tract infection. Generally, possible reasons for clear nasal discharge in upper respiratory tract infections may include cleansing action, nasal irritation, allergic reaction, inflammatory response, nasal polyps, and others. These can be managed through nasal irrigation, avoiding allergens, medication, and other treatments. If discomfort persists, it is recommended to seek timely medical attention and receive symptomatic treatment under a physician's guidance. Detailed explanations are as follows:

1. Cleansing Action

Clear nasal discharge helps clean and flush out viruses and other irritants from the nasal cavity. This is a natural defense mechanism of the body that helps eliminate viruses and bacteria. If there are no additional symptoms of discomfort, specific treatment may not be necessary.

2. Nasal Irritation

Viruses causing upper respiratory tract infections may stimulate the nerve endings in the nasal passages, increasing nasal secretion and resulting in clear nasal discharge. Nasal irrigation using saline or physiological saline solution can help wash away viruses and irritants in the nasal cavity, reduce inflammation, and decrease mucus production.

3. Allergic Reaction

During an upper respiratory tract infection, allergies to the virus or certain substances may trigger allergic rhinitis, causing nasal congestion and increased secretions, which manifest as clear nasal discharge. It is recommended to avoid contact with allergens and follow medical advice to take antiallergic medications such as loratadine tablets or chlorpheniramine maleate tablets, which help suppress allergic reactions and reduce nasal congestion and secretions.

4. Inflammatory Response

When viruses enter the nasal cavity during an upper respiratory tract infection, they can trigger an inflammatory response from the immune system, causing nasal mucosal congestion and inflammation, which may increase mucus secretion and result in watery nasal discharge. It is recommended to take symptomatic medications such as compound paracetamol amantadine capsules or感冒清热颗粒 (Guang'anmen Qingre Granules) under a physician's guidance.

5. Nasal Polyps

Nasal polyps are benign growths in the nasal cavity that may lead to increased nasal secretions. Under a physician's guidance, nasal endoscopic polypectomy can be performed to remove the polyps and alleviate symptoms.

During the recovery period, increasing the intake of foods rich in vitamin C and antioxidant substances, such as spinach, carrots, and apples, can help strengthen immunity and promote recovery from the common cold.