Vitamin A is a fat-soluble vitamin, but also the human body is indispensable trace elements, if the lack of may cause a series of symptoms, but there is no vitamin A deficiency eight symptoms of this statement. Common symptoms are the following: 1, eye abnormalities: is the early manifestation of vitamin A deficiency, patients mostly manifest as blurred vision, photophobia, dry eyes, etc.. Among them, blurred vision and reduced dark adaptation ability can develop into night blindness or even total blindness in severe cases, mostly due to impaired synthesis of retinal violet, resulting in the impairment of light-sensitive pigments in the retina. Photophobia is due to epidermal keratinization of the conjunctiva, which blocks the lacrimal glands and results in corneal dryness. Dry eye occurs mostly after diminished dark adaptation, with dry conjunctiva and cornea, and patients feel itchy. 2. Skin abnormalities: Lack of vitamin A leads to atrophy of sweat glands, which manifests as dry, flaky, rough skin with itchy sensation. With the aggravation of epithelial hyperkeratosis, papules may occur on the lateral side of the upper arm and lower extremity, shoulder, buttocks, back and back of the neck; it may also lead to sebaceous gland atrophy, hair loss or increased dandruff and other symptoms; 3, growth and development disorders: vitamin A deficiency hinders the growth of the body’s bone tissue, resulting in slow growth of children’s long bones, growth retardation, and keratosis hyperplasia of the gums, affecting the development of enamel cells In addition, clinical observation shows that the patient’s height development lags behind, and the enamel easily flakes and loses its luster. In addition, vitamin A deficiency will affect the development of the nervous system, and in severe cases, increased intracranial pressure and spinal nerve atrophy; 4, anemia: vitamin A can maintain the differentiation of epithelial cells to promote the absorption of iron, when vitamin A deficiency, iron can not be properly absorbed by red blood cells will cause anemia; 5, decreased immunity: because vitamin A directly affects the epithelial cells of humoral immunity and cellular immunity, the body plays a If lacking, it will lead to a decrease in the body’s resistance, which will easily lead to secondary infections of certain diseases, such as urinary tract infections, respiratory tract infections, etc.; 6, other: it may also affect the function of the sense of taste and smell, leading to a decrease in appetite. Therefore, it is recommended that patients with this condition should still seek medical attention, improve their diet and supplement vitamin A under the guidance of a doctor, as well as clinical treatment, etc.