**Question:** Oral contraceptive pills do not decrease risk of:

A. stroke
B. breast cancer
C. ovarian cancer
D. uterine cancer

**Core Concept:** Oral contraceptive pills (OCPs) are a form of hormonal contraception that contain synthetic estrogen and progestin hormones. They exert their contraceptive effect by suppressing the hypothalamic-pituitary-ovarian axis, thereby inhibiting ovulation and the menstrual cycle. OCPs also have non-contraceptive benefits, including reduced incidence of endometrial and ovarian cancer. However, they are associated with increased risk of other conditions, such as stroke, breast cancer, and uterine cancer.

**Why the Correct Answer is Right:** Oral contraceptive pills do not decrease the risk of stroke and uterine cancer. Stroke is a consequence of the increased blood viscosity and coagulation risk associated with estrogen exposure. Uterine cancer risk is also increased due to the synthetic progestins in OCPs.

**Why Each Wrong Option is Incorrect:**

A. Stroke: Although OCPs increase blood viscosity and coagulation risk, they do not decrease stroke risk. Stroke is a consequence of atherosclerosis, which is driven by multiple factors, including hypertension, diabetes, smoking, and other lifestyle factors. OCPs do not address these risk factors and may even exacerbate some (e.g., hypertension).

B. Breast cancer: Although OCPs can potentially increase the risk of breast cancer, they are not responsible for this risk. Breast cancer risk is primarily related to genetic predisposition, age, family history, and other lifestyle factors. OCPs do not eliminate breast cancer risk but may slightly increase it.

C. Ovarian cancer: While OCPs can reduce the risk of ovarian cancer, they do not decrease the risk completely. Ovarian cancer risk is influenced by various factors, including age, parity, and family history. OCPs can reduce the risk but are not solely responsible for the risk reduction.

D. Uterine cancer: While OCPs can increase the risk of uterine cancer, they are not solely responsible for this risk. Uterine cancer risk is influenced by factors such as parity, age, and family history. OCPs can increase the risk but are not solely responsible for uterine cancer risk.

**Clinical Pearl:** While OCPs are generally safe and effective for contraception, they are not a comprehensive solution for reducing the risk of stroke, breast, ovarian, uterine, and all other cancers. The benefits and risks should be carefully discussed with patients before prescribing OCPs, considering their individual risk factors and medical history.