Feet turn blue when you sit?

Sitting can cause your feet to turn blue if your legs are crossed or otherwise constricting blood flow to your feet. This can happen because crossing your legs puts pressure on the popliteal artery, which is the main artery that supplies blood to your lower leg. When this artery is compressed, it can reduce blood flow to your feet, causing them to turn blue.

If your feet turn blue when you sit, it's important to uncross your legs and allow your blood to flow freely. You may also want to elevate your feet to help improve circulation. If your feet remain blue after a few minutes, it's important to see a doctor to rule out any underlying medical conditions.