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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.
She may have: 1  too many red blood cells, which can make her blood too thick (polycythaemia). 2  inhaled some of her first poop (meconium), causing breathing problems. 3  low blood sugar (hypoglycaemia) 4  difficulty keeping warm.