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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 taking blood thinners are more at risk from this type of damage since their blood clotting is already restricted. Injections can also be the cause of subcutaneous hematoma (which I get on a regular basis from my medication, Clexane). When an injection punctures the skin on the tummy or thigh it can graze, or pierce straight through, a blood vessel causing blood to seep out into the fatty tissue. If you're injecting Heparin or blood thinners, this can make hematoma worse because your clotting is restricted. Source.