Varicose vein surgery

My mother-in-law has been running a business for a long time.

A lump like a bump on the right ankle of the leg

You had surgery to remove a swollen varicose vein.

The weekly hospitalization cost is 800,000 won.

You are still taking the medication.

My sister has also been working at a beauty salon for a long time.

I have varicose veins, so I take medication.

My mother on my biological mother's side also has severe varicose veins.

I don't have surgery, but I take medication.

Why do varicose veins occur?

Is it because I stood for a long time?