The reasons why patients wake up with swollen eyes are as follows: 1, caused by drinking too much water at night; 2, poor sleep at night, insomnia, resulting in sleep deprivation, there may be swollen eyes; 3, eye skin if contact with allergens caused by allergic conjunctivitis, there may be swollen eyelids, and may be accompanied by itching skin or eyes with a foreign body sensation and other situations; 4, bacterial infection Caused by bacterial infection, such as bacterial infection caused by local cellulitis or bacterial conjunctivitis, there may be local redness, swelling, heat, pain and inflammatory manifestations; 5, heart disease, nephritis, cirrhosis of the liver and other chronic diseases, there may also be swelling of the eyelids. Therefore, further examination is needed to clarify the cause of this condition and targeted treatment according to the cause.