I'm curious about prevention methods for varicose veins.

My acquaintance's mother had severe varicose veins.

I also saw my mother some time ago, and her blue veins were all bulging out on her calves.

At that time, I didn't even know what it was and wondered why my calf was like that, so I asked my friend, and she said it was varicose veins.

My mother said she works standing for a long time at a restaurant. I wonder if standing for a long time makes her prone to varicose veins, if there are any preventive measures, and what the symptoms are.