Asthma, allergies, and nosebleeds. Might they be linked?

Yes and no. Asthma and allergies are closely linked. About 80-90% of kids with asthma have allergies and up to 30% of people with allergies have asthma. Nose bleeds are not linked specifically to either. However, people with nasal allergies who blow their nose hard, pick their nose or use nose sprays are more likely to have nose bleeds.