Eyes swell after crying, mainly because the anatomy of the eyes is different from other parts of the body. The eyelid skin is thin and has a lot of loose connective tissue, which causes the eyes to swell after crying. 1. Anatomy: The eyelid skin is thin and loose, so when you cry, tears are produced and not drained in a short time, leading to increased osmotic pressure in the subcutaneous tissues of the eyelids, and tears accumulate in the tissue spaces and cannot be metabolized in time, resulting in edema. 2. External stimulation: When you cry, people usually rub their eyes. The external stimulation will cause the skin of the eyes to become congested, leading to increased redness and swelling. The swollen eyes will usually gradually improve with the absorption of tears, you can also use the cold compress method to help reduce swelling, but need to pay attention to the cold compress temperature is not too low, so as not to frostbite the skin at the eyes. If the swelling does not improve or does not go down for a long time, you need to consider that there may be some diseases in the eye itself, such as allergies, inflammation, etc. Crying just causes the symptoms of swelling to become more pronounced, so you need to go to the hospital for consultation and treatment to deal with the specific cause.