What are the symptoms of varicose veins?

When I go about my daily activities, sometimes my legs feel very numb. While walking, I occasionally felt a tingling sensation like electricity running through the soles of my feet, but over time I got used to it and the pain seemed to dull. Looking back, I wonder if it's caused by poor blood circulation. Sometimes at night, I wake up because my legs cramp or go numb. Later, I found out that these symptoms might be related to varicose veins. Since my health hasn't been great this year, I've become more interested in these issues, and whenever something happens, I tend to associate it with my body. I'm not very knowledgeable about varicose veins, so I'm curious about what the exact symptoms are. What are the specific symptoms?