The nose is a part of the body that is very rich in blood vessels (vascular) and is situated in a vulnerable position on the face. Any trauma to the face can cause bleeding from the nose. This is common in dry climates, or during

the winter months when the air is dry and warm from household heaters.

Causes of Nose Bleed
Trauma to the nose (nose picking, foreign bodies, forceful nose blowing).
The most common cause of a nose bleed is drying of the nasal membranes.
Tumors, particularly malignant tumor of the nose or sinuses.
The incidence of nosebleeds is higher during the colder winter months when upper respiratory infections are more frequent, and the temperature and humidity fluctuate more dramatically.
Use of "blood thinning medications" called anti coagulants.
Recurrent nosebleeds may be a symptom of an underlying disorder such as high blood pressure.
Inflammation of the nose or sinuses and cold may cause a nose bleed.
Deviated septum (when the partition between your nose is crooked), foreign objects in the nose, or other nasal obstruction may also cause nosebleeds.