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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.
Here are some good tips: 1  Sunshine. Sunshine has been found to maximize circulation and to keep the blood thin. 2  Exercise. People who exercise too much run the risk of having vitamin K levels that are too low. 3  Avoid foods that thicken the blood. There are some foods that cause the blood to thicken. These include kale, spinach, collard greens, parsley, cauliflower, asparagus, leeks, and celery.