Swelling of the eyes when wearing contact lenses may be caused by keratitis, conjunctivitis, dry eye, etc. Patients should consult a doctor in time to clarify the cause of the disease and then carry out appropriate treatment. 1. Keratitis: Wearing contact lenses with inadequate care or wearing them for too long may induce keratitis, resulting in very swollen eyes, and patients may also experience eye pain, photophobia, redness and swelling of the eyelids and other symptoms. 2. Conjunctivitis: Wearing contact lenses without proper cleaning may lead to conjunctivitis, causing eye swelling, redness of the white of the eyes, itchy eyes, tearing and other symptoms. 3. Dry eye: Wearing contact lenses with swollen eyes may also be caused by dry eye due to reduced tear secretion, and patients may also have symptoms such as eye fatigue and foreign body sensation, which can be treated with artificial tears. At the same time, we should pay attention to control the time of wearing contact lenses. If your eyes are swollen when wearing contact lenses, and you don’t see any relief after resting for a long time, you should consult a doctor in time to check the care of your contact lenses and whether there is any inflammation or damage to your eyes, so as to avoid delaying your condition.