Excessive intake and absorption of vitamin A can cause poisoning, vitamin A taken in moderation is good for the body, especially the eyes, such as acute poisoning and symptoms are mainly headache, vomiting and increased cranial pressure. The symptoms of chronic vitamin A poisoning are dry and peeling skin, eye twitching, high blood calcium, enlarged liver and spleen, and other symptoms, and cause not want to eat, anal itching, weight loss, serious will appear bone swelling, etc. Treatment is strictly prohibit the intake and absorption of vitamin A, the symptoms will naturally ease slowly.