Final answer:
The optimal time for a breast self-examination is 5 to 7 days after menses ceases, as the breasts are least likely to be swollen or tender, aiding in the early detection of breast cancer.
Step-by-step explanation:
The best time for a breast self-examination is generally 5 to 7 days after menses ceases. This is due to the effect of cyclic ovarian changes on the breast tissue. During this time, the breasts are least likely to be swollen or tender, making it easier to detect any unusual changes or lumps. Monthly breast self-exams are important because they can help in the early detection of breast cancer, which often has a better outcome when treated early. The menses phase of the menstrual cycle is when progesterone, FSH, and LH levels are low, following the decline of progesterone due to the degradation of the corpus luteum. This hormonal state typically leads to less breast tenderness and an optimal condition for self-examination.