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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.
People with thick sticky blood have a much higher chance of strokes, heart attacks and high blood pressure. These problems may happen when you are still relatively young, say in your forties and fifties. This is a well-known fact and has led to the widespread use of daily aspirin to thin the blood.