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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.
If you have high blood pressure, your doctor may ask you to check it at home. High blood pressure can cause the heart muscle to thicken.The correct answer is true. As the heart muscle works harder, it can become so thick that it doesn't get enough oxygen. This can cause chest pain and may lead to heart failure.