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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.
What is the cause of thick blood during menses and it is strechy? Normal.: Rising serum Estradiol concentrations result in gradual thickening of the uterine endometrium and an increase in the amount and stringiness (spinnbarkeit) of the cervical mucus. Many women are able to detect this change in mucus character.