Blue veins are like tiny pipes that carry blood throughout our body. They look blue because the blood inside them has less oxygen than the blood in the arteries which makes it appear darker. When our blood is filled with oxygen it looks bright red, but when it has less oxygen it turns darker in color.
In Pakistan, some people may have blue veins that appear more prominently on their skin. This is because their skin may be lighter in color which makes the veins stand out more. Additionally, the veins may be closer to the surface of the skin which also makes them more visible.
Having blue veins is completely normal and nothing to worry about. It just means that the veins are carrying blood throughout our body. If you ever see blue veins on your skin, don't be afraid! It's just a part of our body's natural workings.