Puffy eyelids can be caused by drinking too much water before going to bed, conjunctivitis, and allergies. You can choose cold compresses, anti-inflammatory drugs and anti-allergy drugs for treatment and relief. 1. Drinking too much water before going to bed: Drinking a lot of water before going to bed at night will increase the burden on the kidneys, which will lead to the symptoms of eyelid swelling, you can choose to apply cold compresses to relieve the symptoms of eyelid swelling. 2. Conjunctivitis: when there is a germ or bacterial infection in the eye, it will cause inflammation of the small blood vessels in the conjunctiva, and the symptom of swollen eyelids will appear, you can choose anti-inflammatory drugs for treatment to alleviate the problem, such as levofloxacin eye drops and so on. 3. Allergy: when patients come into contact with their own allergic substances, it will lead to eyelid swelling, you can choose anti-allergy drugs for treatment and relief, such as ketotifen eye drops and so on. When patients have symptoms of eyelid swelling, it is recommended to go to the hospital in time for examination and diagnosis, and under the guidance of the doctor for medication, do not take medication without authorization, in order to avoid adverse consequences.