Early symptoms of varicose veins

I've heard of varicose veins many times, but I didn't know exactly what kind of disease it was.

This time, I found that the early symptoms include swelling in the legs and frequent cramps, especially at night.

I thought it was a disease unrelated to me, but although not often, I sometimes get cramps occasionally, so I need to pay attention to it.

Are you doing anything to prevent varicose veins?