Natural apparently
does not mean painless.

I have read up. Period pain can be mild. It can also be so severe that it becomes hard to function. You cannot see the whole difference from the outside of a human.

Heat can ease period pain. Studies support this, but several are small. Possible explanations are an effect on pain signals and less muscle tension. The full effect is not settled.

Many people say they use heat for cycle-related symptoms. That tells me about use, not about how well the heat works.

And heat does not help everyone equally. Some people also need medication or other treatment. That is not something I get to decide from a drawing.