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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.
She may have: 1  too many red blood cells, which can make her blood too thick (polycythaemia). 2  inhaled some of her first poop (meconium), causing breathing problems. 3  low blood sugar (hypoglycaemia) 4  difficulty keeping warm.