In comparison, venous thromboembolism occurs in 100–200 per 100.000 pregnant women every year.One study showed more than a 600% increased risk of blood clots for women taking COCPs with drospirenone compared with non-users, compared with 360% higher for women taking birth control pills containing levonorgestrel. The U.S. Food and Drug Administration (FDA) initiated studies evaluating the health of more than 800,000 women taking COCPs and found that the risk of VTE was 93% higher for women who had been taking drospirenone COCPs for 3 months or less and 290% higher for women taking drospirenone COCPs for 7–12 months, compared with women taking other types of oral contraceptives.Based on these studies, in 2012 the FDA updated the label for drospirenone COCPs to include a warning that contraceptives with drospirenone may have a higher risk of dangerous blood clots.A 2015 systematic review and meta-analysis found that combined birth control pills were associated with 7.6-fold higher risk of cerebral venous sinus thrombosis, a rare form of stroke in which blood clotting occurs in the cerebral venous sinuses. Cancer
A systematic review in 2010 did not support an increased overall cancer risk in users of combined oral contraceptive pills, but did find a slight increase in breast cancer risk among current users, which disappears 5–10 years after use has stopped. Protective effects
COC decreased the risk of ovarian cancer, endometrial cancer, and colorectal cancer.
Capillariasis is a disease caused by nematodes in the genus Capillaria. The two principal forms of the disease are:

Intestinal capillariasis, caused by Capillaria philippinensis
Hepatic capillariasis, caused by Capillaria hepatica


== References ==