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The extra red blood cells make your blood thicker than normal. As a result, blood clots can form more easily. These clots can block blood flow through your arteries and veins, which can cause a heart attack or stroke. Thicker blood also doesn't flow as quickly to your body as normal blood.
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.