Painful and swollen eyes may be caused by dacryoadenitis, or glaucoma or blepharitis. 1. Dacryoadenitis: it can be caused by bacterial or viral infection, and may be manifested as redness, swelling and pain in the outer part of the eyelid. 2. Glaucoma: With glaucoma, an acute attack that causes an increase in intraocular pressure may induce symptoms such as swelling and pain in the eyes, which, if left untreated, will eventually affect vision. 3. Blepharitis: It is mostly an inflammatory reaction of the blepharoplasty gland caused by bacterial infection, which may have typical manifestations such as redness, swelling, heat and pain. Swelling and pain in the eyes, in addition to the above factors, should also be considered as a result of keratitis, conjunctivitis and other diseases, it is recommended that timely consultation and treatment.