19 Silent Signs of Lung Cancer You Need to Be Aware Of

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“The vena cava is the major vein that drains deoxygenated blood back into your heart,” explains Chen. However, when a tumor in your lung gets big enough, it can physically compress the vena cava. This phenomenon, known as superior vena cava syndrome (SVCS), causes decreased blood flow to the heart and the rest of the body, which can result in swelling in the face, neck, upper body, and arms.

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