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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.
What your results mean Clotting too slowly. Blood that clots too slowly can be caused by: Blood-thinning medications ; Liver problems; Inadequate levels of proteins that cause blood to clot; Vitamin K deficiency; Other substances in your blood that hinder the work of clotting factors; Clotting too fast. Blood that clots too quickly can be caused by: