Eyes on fire always tearing, the causes include physiological and pathological, pathological factors include conjunctivitis, etc., mainly through medication such as antibiotics, artificial tears and so on. 1. Physiological factors: prolonged overuse of the eyes, often stay up late and lack of sleep, anxiety and depression and other factors, can lead to the symptoms of watery eyes. Avoid prolonged use of the eyes, develop a good routine can effectively alleviate the symptoms. 2. Pathological factors: when the eye is stimulated to cause conjunctivitis, there can be photophobia and tearing, itching, increased secretion and other symptoms, commonly used medication, including levofloxacin eye drops, acyclovir eye drops, erythromycin and so on. It is necessary to choose the appropriate medication and dosage for treatment under the guidance of a doctor. If your eyes are always watering and cannot be relieved after resting, and accompanied by other discomforts, you should go to the hospital immediately.