What causes blood clots in the nose without bleeding?

Generally, blood clots in the nose without active bleeding may be caused by dryness and cracking of the nasal cavity, forceful nose-blowing injuries, atrophic rhinitis, allergic rhinitis, or deviated nasal septum. It is recommended to seek timely medical attention to identify the underlying cause and receive appropriate treatment under a doctor's guidance. Specific analysis is as follows:

1. Nasal Dryness and Cracking: In dry environments or due to insufficient water intake, the nasal mucosa becomes dehydrated and fragile, causing tiny blood vessels to rupture and form clotted blood. Use a humidifier indoors to maintain moisture levels, drink 1500–2000 mL of warm water daily, and apply physiological saline nasal sprays to keep the nasal passages moist.

2. Injury from Forceful Nose-Blowing: Excessive force when blowing the nose can tear capillaries in the nasal mucosa, leading to blood clot formation before significant bleeding occurs. Avoid aggressive nose-blowing; instead, gently blow one nostril at a time. When experiencing nasal discomfort, use saline rinses rather than harsh wiping.

3. Atrophic Rhinitis: Chronic dryness and shrinkage of the nasal mucosa reduce glandular secretions, making the lining prone to damage and blood clot formation, often accompanied by a sensation of nasal foreign body. Patients may use medications such as compound menthol nasal drops, vitamin AD drops, or isotonic seawater nasal sprays as directed by a physician.

4. Allergic Rhinitis: After exposure to allergens, nasal mucosal congestion and swelling occur, and blood vessel rupture during sneezing or nose-rubbing can lead to clot formation, along with symptoms like nasal itching and runny nose. Medications such as loratadine syrup, budesonide nasal spray, and montelukast sodium chewable tablets may be used under medical supervision.

5. Deviated Nasal Septum: The mucosa at the site of deviation is thin and vulnerable to airflow irritation, making it susceptible to injury, bleeding, and clotting—clots often consistently appearing on the deviated side. A septoplasty procedure can correct the structural deviation, improve nasal airflow, and reduce mucosal trauma and clot formation.

In daily life, avoid using sharp objects to clean the nose and regularly wash bedding to minimize allergens. Eat more fruits and vegetables rich in vitamin C to enhance mucosal repair. Wear a medical mask when outdoors in windy, sandy, or polluted environments to protect the nasal cavity.