do allergies cause bleeding
Other causes of nosebleeds include: 1  Acute sinusitis. 2  Allergies. 3  Aspirin use. 4  Bleeding disorders, such as hemophilia. 5  Blood thinners (anticoagulants), such as warfarin and heparin. 6  Chemical irritants, such as ammonia. 7  Chronic sinusitis. 8  Cocaine use.