My brother often bleeds from the nose, sometimes when he is riding a bike, sometimes when he is at rest. Is this concerning? Is there a possible cause?

It is possible that there could be several causes for frequent nosebleeds, such as dry or irritated nasal passages, fragility of blood vessels in the nose, or the use of certain medications or drugs. It is recommended to try hydrating the nose with saline solution as a first step, but if this does not help, it would be best to consult a doctor to determine the underlying cause of the nosebleeds.