Allergic rhinitis nosebleeds What's going on?

Allergic rhinitis patients nosebleed mainly because nasal mucosa congestion edema, nasal mucosa under the vasodilation, nasal mucosa thinning, increased fragility of the mucosa, due to nasal mucosa is too fragile, in repeated coughing, sneezing, runny nose, it will easily lead to blood vessel rupture, causing repeated epistaxis.