Question about varicose veins

Lately, I've been standing and working so much that I think my legs are strained, and suddenly some veins are protruding.

I didn't find out about this recently on my own; I learned about it because my friend told me when I went to the sauna.

The symptom is a feeling of numbness in the leg, could it definitely be deep vein thrombosis?

The hospital will be the answer, right??