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. In addition, changes from a bitter cold outside environment to a warm, dry, heated home results in drying and changes in the nose which will make it more susceptible to bleeding. Nosebleeds also occur in hot dry climates with low humidity, or when there is a change in the seasons.
The following factors predispose people to nosebleeds
- Trauma, including self–induced by nose picking.
- Allergic and non–allergic rhinitis.
- Hypertension (high blood pressure).
- Use of blood thinning medications.
- Alcohol abuse.
- Less common causes include tumors and inherited bleeding problems.