A swollen or puffy face is a possible indicator of lung cancer. Usually in this case the area around the eyes swells.
Most people ignore this sign as a puffy face is associated with many common health problems like cold or lack of sleep. Over time, people get used to it, until it becomes difficult to ignore.
In lung cancer, the face swells because the lung tumor blocks blood flow to the superior vena cava blood vessel.
This is considered the first sign of lung cancer and is mostly seen when the person is lying down.
Puffiness is often associated with redness on the face.