Will medical compression stockings help with varicose veins?

Does using medical compression stockings help alleviate symptoms of varicose veins?

Or maybe I don't have varicose veins right now, but my calves feel very tired even after just walking a little, and my calves feel swollen and tight.

Would it be helpful to use compression stockings in advance to promote better blood flow?

Varicose veins don't necessarily have to be visibly bulging to be diagnosed, right?

In the case of a friend, they said it feels like ants crawling on their legs, ranging from a tingling sensation to a stinging feeling.

I'm also curious if there are any specific measures you are taking to prevent varicose veins.