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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.
Taking â¦ both could cause the blood to become too thin and to not clot when it's necessary, like when there's been an accident. I am not a doctor or nurse, but I do have some other training (personal care aide). Also, a close relative and a former client of mine have been on blood thinners before.