The reason for why your eyes keep stinging is irritation, inflammation, dry eyes and wrong prescription of glasses or contact lenses. Usually, eye itchiness, wateriness or excessive eye discharges can happen at the same time as stinging. Your eyes may be irritated by certain chemicals or environment, such as detergent, cosmetics and gusty wind. If your eyes are red, you may have got pink eye which is caused by infection from bacteria or viruses. If you catch a cold or flu, you will also have this problem. Eye dryness can make your eyes stinging, for there are not enough tears to protect your eyes. Besides, overuse of eyes can lead to eye stinging. If you are glasses or contact lenses wearer, your eyes may be stinging because of the strain from the wrong prescription.