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Thick blood may also be caused by the presence of harmful pathogens such as fungi, viruses, bacteria, and parasites. These pathogens can actually activate a coagulation response in the body as a way to avoid being attacked by the bodyâs immune system.
Abnormal blood clotting: Anything that interferes with blood clotting can lead to nosebleeds. Medications, even common ones like aspirin, can alter the blood-clotting mechanism just enough to cause bleeding. Blood diseases, such as hemophilia, also can provoke nosebleeds.