Ordinary swelling around the eyes means you have an excessive accumulation of fluids, called edema, in surrounding skin tissue. Because the skin around the eyes is the thinnest skin in the body, swelling and discoloration can be quite prominent.
But why does fluid accumulate to form puffy eyes in the first place?
Edema around the eyes generally results from a variety of factors, including:
Overconsumption of salt, which causes fluid retention
Allergies that can cause inflammation and swelling
Sinus problems
Dehydration
Fatigue and lack of sleep
Stress
Crying
Aging