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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.
High levels of abnormal white blood cells can cause anemia, tiredness, weight loss, bone pain and frequent infections. Most seriously, people with thick blood -- whether from excessive blood cells or hypercoagulation -- are at high risk for clots that block or limit blood flow to vital organs.