What causes sneezing through the nose?

Under normal circumstances, sneezing may be caused by factors such as odor irritation, cold air stimulation, upper respiratory tract infections, allergic rhinitis, or acute rhinitis. Patients should promptly visit a reputable medical facility to determine the underlying cause and receive appropriate treatment. Specific analyses are as follows:

1. Odor Irritation

Certain odors can irritate the nasal mucosa, triggering the body's defense response. Strong smells—such as perfumes, chemicals, or other irritating odors—may stimulate nerve endings in the nasal lining, causing them to become excited and leading to sneezing. This is a protective reflex that helps expel irritants from the nasal passages and typically does not require specific treatment.

2. Cold Air Stimulation

Cold air can irritate the nasal mucosa and trigger a neural reflex. When cold air enters the nasal cavity, it stimulates nerve endings inside the nose, sending impulses to the brainstem and resulting in a reflexive sneeze. This is a normal physiological response, and adequate warmth protection in daily life is usually sufficient.

3. Upper Respiratory Tract Infection

Viral or bacterial infections of the upper respiratory tract often lead to inflammatory reactions in the nasal cavity, causing symptoms such as mucosal congestion and swelling. These changes stimulate nerve endings, resulting in sneezing, fever, coughing, and other symptoms. Under medical guidance, patients may use medications such as Compound Liquorice Tablets, Lianhua Qingwen Capsules, or Ganmao Ling Granules for treatment.

4. Allergic Rhinitis

In individuals allergic to allergens such as pollen, dust mites, or animal dander, exposure to these substances activates the immune system, prompting the release of inflammatory mediators like histamine. This leads to nasal mucosal swelling and congestion, stimulating nerve endings and causing symptoms such as sneezing and runny nose. Under medical supervision, patients may take antihistamines such as Loratadine Tablets, Cetirizine Hydrochloride Tablets, or Ebastine Tablets to alleviate symptoms.

5. Acute Rhinitis

When bacteria or viruses infect the nasal mucosa, they cause inflammation characterized by mucosal congestion and swelling. This irritation of nerve endings results in symptoms such as sneezing. Under a doctor’s guidance, patients may use intranasal sprays such as Mometasone Furoate Nasal Spray, Fluticasone Propionate Nasal Spray, or Oxymetazoline Hydrochloride Nasal Spray to relieve symptoms.

In daily life, it is recommended to maintain a positive mindset, avoid spicy, irritating, and greasy foods, get adequate rest, and develop healthy lifestyle habits.