What is a common side effect of using the contraceptive sponge?

The common side effect of using the contraceptive sponge is that it can cause irritation. The contraceptive sponge is designed to be inserted into the vagina, and for some users, the material of the sponge or the spermicide it contains may lead to localized irritation, discomfort, or allergic reactions. This sensitivity can manifest as itching, redness, or discomfort during use.

Other options do not typically align with the known side effects of the contraceptive sponge. Improved mood is not a documented effect of the sponge, and while some contraceptive methods might influence hormonal mood changes, the sponge's primary function is mechanical and chemical. Increased menstrual flow is not a common side effect associated with the sponge; rather, it may have a neutral or varying effect on menstrual cycles depending on the individual. Numbness is also not related to the sponge's use, as it does not have any numbing properties or impact systemic nerve functions.