Continuous watering and pain in one eye can be caused by a minor scratch, a speck of dust, or mild inflammation. For immediate, safe relief, you can use preservative-free artificial tears (lubricating eye drops) to soothe the irritation. Please avoid using medicated drops, like antibiotics or steroids, without a doctor's prescription. To protect your eye, do not rub it. If you suspect something is in your eye, gently flush it with sterile saline. Since pain is present, it is highly recommended to have an eye specialist examine your eye promptly to ensure proper healing.