1 doctor weighed in:

What are the causes of nose bleeding ? And how to treat them ?

1 doctor weighed in
Dr. Dominic Riganotti
Internal Medicine - Infectious Disease

In brief: Many things

Dry, heated, indoor air. Dry, hot, low-humidity climates, Colds (upper respiratory infections) and sinusitis, Vigorous nose blowing or nose picking.
Allergic and non-allergic rhinitis. High blood pressure . Chemical irritants (e.g., cocaine, industrial chemicals, others). Injury to the nose and/or face. Deviated septum.

In brief: Many things

Dry, heated, indoor air. Dry, hot, low-humidity climates, Colds (upper respiratory infections) and sinusitis, Vigorous nose blowing or nose picking.
Allergic and non-allergic rhinitis. High blood pressure . Chemical irritants (e.g., cocaine, industrial chemicals, others). Injury to the nose and/or face. Deviated septum.
Thank