People can have puffy eyes when the skin around eyes is irritated or inflamed. Most cases of puffy eyelids are caused by allergies. But someone just have congenital puffy eyes due to a genetic predisposition. Taking in too much salt can also cause puffy eyes.
If you take in too much salt the day before or drink caffeinated beverages or alcohol, it will cause fluid retention in the skin around the eyes and cause puffy eyes. If you often wear eye makeup, it may caused by irritation to these chemical materials.
Fluid retention, stress, allergies, and hormone changes can cause puffy eyes. Skin around the eyes is thin, delicate and sensitive, so it can easily become irritated. If your puffy eyes make you get pain or blurred vision, you should go to see a doctor immediately.