Soaking your feet can help with menstrual cramps, as long as the menstrual flow is not too heavy. You can add some Chinese herbal medicine to the footbath, or just use plain warm water. Soaking your feet helps to activate blood circulation and can relieve menstrual cramps, which are often caused by smooth muscle spasms related to being chilled. Getting chilled often leads to spasms and increased pain in smooth muscles. You can soak your feet for an extended period as long as the water temperature is not too hot. Additionally, applying a hot water bottle directly to the abdomen can also be quite effective. Generally, it's best to avoid using painkillers directly, as medications can be harsh on the stomach and have other side effects.