Varicose veins have started appearing on my leg? I have some questions

AcerPink23

I have several big varicose veins that have appeared on my upper leg. It seems as if these have started to appear since I started exercising more intensely. I don't know if exercise is the cause? I do stand for long periods of time at my job. I'm about 190 pounds, do they usually appear from being overweight? Is it normal for them to appear on a young person? I'm 23.

Also, is there anyway to prevent them from appearing and or/treatments to get rid of them? Hopefully they aren't permanent. Thanks!

Angela.