There is no relevant data to show that flat feet must be genetic, but can also be caused by acquired factors. First, genetic factors cause flat feet, one or both parents have flat feet, the children may be born with flat feet and improper weight line, but there are usually no clinical symptoms, as they grow older, flat feet develop seriously or are affected by other conditions before symptoms appear; second, acquired factors cause flat feet, even if the arch and weight line are completely normal, but the strength of the internal and external muscles of the foot is weak and insufficient for a long time, also Even if the arch and weight-bearing line are completely normal, but the strength of the internal and external muscles is weak and insufficient for a long time, it can also cause flat feet, such as overweight, poor standing or walking posture, and foot muscle atrophy after a long illness. This shows that flat feet have both genetic and acquired factors, and are not necessarily caused by genetics.