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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.
While having thinner blood may stave off any alarming blood circulation issues, blood that is too thin may lead to complications as well. With a lack of platelets in the blood to increase viscosity, continual bleeding â where your wounds and cuts have trouble forming blood clots to stop the bleeding â may cause some amount of frustration, and may even end up becoming a dangerous problem.