The most common cause of frequent nosebleeds is the dry air especially during the winter months when your heating is on and drying out the air.
It's very common to get nosebleeds during the winter when the air is dry in your home mostly during the winter but it can also happen any time of the year.
You can help prevent nosebleeds by adding humidity to the air in your home by using a humidifier or vaporizer or having a humidifier added onto your furnace.
When your nasal passages get dried out then the tiny blood vessels in your nose crack which then leads to nosebleeds.
Other things such as medicines including antihistamines and decongestants for allergies and colds can also cause your nasal passages to dry out which can lead to nosebleeds.