Itâs happened before. An otherwise healthy 29-year-old mother of three made news in 2014 when she died of the flu and, according to data from the [Centers for Disease Control and Prevention (CDC), between 3,000 and 49,000 Americans die of the flu each year.
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.
In most cases, people with allergies develop mild to moderate symptoms, such as watery eyes, a runny nose or a rash. But sometimes, exposure to an allergen can cause a life-threatening allergic reaction known as anaphylaxis.naphylaxis symptoms occur suddenly and can progress quickly. The early symptoms may be mild, such as a runny nose, a skin rash or a strange feeling.. These symptoms can quickly lead to more serious problems, including: 1  Trouble breathing. 2  Hives or swelling. 3  Tightness of the throat. 4  Hoarse voice. 5  Nausea. 6  Vomiting.