Early stage of varicose veins?

My calves are not feeling well.

I really get sick oftenㅠ I feel like I’ve walked a lot...

The night before my period, my legs hurt so much that I have a hard time sleepingㅠ

I've lived for decades thinking that I have an upper body obesity, and maybe that's why my legs carry more weight.

A new neighbor mentioned varicose veins, so I was wondering, what exactly is varicose veins?