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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.
All of these make your blood hypercoagulable, meaning it makes it thick and slow moving, which increases your risk of having a blood clot or stroke. Hypercoagulable blood contributes to inflammation, because when your blood does not flow well, oxygen can't get to your tissues.