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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.
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.