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Thick blood is caused by a variety of conditions, such as heavy proteins in the blood, too much blood in circulation or a blood clot system imbalance, according to Southeastern Medical Oncology Center. Diseases such as cancer and lupus can also lead to thick blood. Continue Reading.
The blood must first be thinned to expose the pathogens before they can be eradicated. Heavy metal toxicity or exposure to environmental toxins can also activate unusual production levels of soluble fibrin monomer (SFM). Stress and trauma have also been known to cause thick blood.