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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.
Quick Answer. People whose blood is too thin are prone to excessive bleeding that is potentially dangerous. Those with thin blood lack sufficient platelets, which are cell fragments that help the blood form clots. Health Guidance reports these people tend to experience nose bleeds, bleeding gums, frequent bruising all over their bodies and even blood in their urine. Continue Reading