Is there a man with seven fingers in China?

China has seven fingers. Seven fingers are usually caused by genetic factors. If both parents have polydactyly, or both parents have polydactyly patients in their families, then the probability of offspring getting sick is higher. Acquired factors include radioactive factors. If you receive X-ray examination during pregnancy, even if you are overexposed to radiation, you will have polydactyly. Moreover, endocrine factors can also lead to polydactyly. For example, parents with diabetes will increase the incidence of polydactyly.