It is caused by eating too many foods rich in carotene (carrots, pumpkins, oranges, etc.), so that a large amount of carotene can not be converted into vitamin A in small intestinal mucosal cells quickly enough. Although the intake of β -carotene can be converted into vitamin A in the body, its absorption is only one third, and only half of the absorbed carotene can be converted into vitamin A, so only one-sixth of the intake of carotene plays the role of vitamin A, so a large intake of half of carotene will not cause vitamin A excess, but it can increase the level of carotene in the blood and cause carrot disease. The content of serum carotene increased significantly, reaching 4.7 ~ 9.3 μ mol/L (normally about1.9 ~ 2.7 μ mol/L), which caused yellow pigment to deposit in the skin and subcutaneous tissue, so it was more orange than nose tip, nose lip wrinkle, arm forehead, palm and sole skin, but there was no yellow stain on sclera. Generally, carotene anemia is a benign process, which can gradually subside within 2 ~ 6 weeks after stopping eating a lot of carrot food. No special treatment is needed.