Many people in life often feel dry, itchy and dry eyes, which are common clinical symptoms in ophthalmology. Many people will bring their own eye drops to relieve this discomfort. The causes of dry and itchy eyes are as follows: 1. Allergic factors: Allergy is a common factor in dry and itchy eyes. Allergic reactions caused by foreign body stimulation such as allergy caused by allergen stimulation, cosmetic allergy, drug allergy and other factors can cause dry and itchy eyes, accompanied by skin papules, eyelid redness, etc.; 2, vitamin deficiency: the lack of certain vitamins can cause dry and itchy eyes. Such as vitamin A and B vitamin deficiency can lead to dry and itchy eyes. 3, environmental factors: long-term work in the open air conditioning, air does not circulate the environment of the staff, dry air in autumn and winter can induce dry and itchy eyes. 4, bad habits: computer workers, look at the cell phone for a long time, excessive eye patients, blinking the number of times to reduce the cornea can not get enough moisture, over time the eyes will appear dry and itchy symptoms, often called “video terminal dry eye” 5, inflammatory infections: eye bacteria and viruses and other pathogenic infections can lead to dry and itchy eyes. Such as keratitis, spring conjunctivitis, trachoma caused by Chlamydia infection, etc. 6, systemic diseases: dry syndrome and other autoimmune diseases, and diabetes can also cause dry and itchy eyes. Often dry and itchy eyes symptoms, to pay attention to, do not just go to the drugstore to buy a bottle of eye drops on the end of the matter. It is very dangerous to use eye drops indiscriminately. It is advisable to seek medical attention when the symptoms of dry and itchy eyes appear.