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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.
In rare cases, your body may begin to produce too much IgM. When this happens, your blood will become thicker (a symptom known as âhyperviscosityâ), making it difficult for all of your organs and tissues to function properly. This condition is known as WaldenstroemâwaldenstrÃ¶m s. disease