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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.
However, if you on a blood thinning medication like Coumadin (Warfarin) or Plavix (Clopidogrel), talk to your doctor about dangers of consuming too much blood thinning foods coupled with prescriptions that could lead to excessive bleeding.