What causes nosebleeds when blowing the nose due to a cold?

Generally, nosebleeds when blowing the nose during a cold may be caused by frequent nose-blowing, fragile blood vessels, dry nasal passages, or dry nasal mucosa. The specific reasons are analyzed as follows:

1. Frequent nose-blowing: During a cold, the nasal cavity often produces excessive mucus. Blowing the nose too frequently and forcefully may irritate the blood vessels inside the nasal cavity, leading to bleeding.

2. Fragile blood vessels: Some individuals have particularly delicate blood vessels in their nasal passages, making them more susceptible to irritation and nosebleeds. Applying a cold compress or ice pack to the nose can help constrict the blood vessels and reduce bleeding.

3. Dry nasal passages: Excessive mucus and increased frequency of nose-blowing during a cold can easily lead to dryness in the nasal cavity, resulting in nosebleeds. Using saline solution or nasal drops can help keep the nasal passages moist and prevent dryness.

4. Nasal mucosal damage: During a cold, the nasal mucosa may be attacked by viruses or bacteria, causing damage to the mucosal lining and increasing the likelihood of nosebleeds. Avoid blowing the nose to prevent further irritation. Under medical guidance, hypertonic seawater nasal sprays can be used to clean the nasal cavity, inhibit bacterial growth, assist in reducing inflammation, and relieve nasal discomfort.

5. Dry nasal mucosa: During a cold, the nasal mucosa may become dry. This dryness can weaken the surface blood vessels of the mucosa, making them prone to bleeding.

For the above situations, timely hemostatic measures should be taken. If symptoms persist or worsen, prompt medical attention is recommended.