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Thick blood may also be caused by the presence of harmful pathogens such as fungi, viruses, bacteria, and parasites. These pathogens can actually activate a coagulation response in the body as a way to avoid being attacked by the bodyâs immune system.
Abnormal thickening of the uterine wall occurs when estrogen and progesterone hormonal levels are imbalanced: excess estrogen with low or no levels of progesterone. The imbalance can result from overproduction of estrogen, estrogen replacement therapy, ovarian tumors, tamoxifen use, obesity combined with diabetes, and menopause, notes Patient.co.uk.