What allergen caused the patient's rhinitis in September?

Patients developing rhinitis in September are usually allergic to pollen, cold air, mold, and other allergens. The specific analysis is as follows:

1. Pollen

Exposure to allergens is a common cause of rhinitis. In September, the natural temperature remains relatively warm, and many types of flowers bloom during this season. Pollen in the air can easily irritate the nasal mucosa, triggering allergic reactions such as congestion, swelling, sneezing, and other discomforts.

2. Cold Air

By September, summer is ending and autumn beginning, leading to significant fluctuations in ambient temperature. If the nasal passages are suddenly exposed to cold air, it may reduce their protective function, increasing susceptibility to allergies and resulting in rhinitis.

3. Mold

The environmental humidity and temperature during August and September are favorable for mold growth. Patients with allergic constitutions or low resistance may experience allergic reactions in the nasal mucosa, leading to allergic rhinitis.

In addition, dust mite allergy could also be a contributing factor. It is recommended to seek medical evaluation for allergen testing to identify specific triggers and receive appropriate treatment under a doctor's guidance.