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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. You shouldn't eat these foods if you want to have thin blood.