The graying of yellow throat glans is related to genetic problems. Genes play an important role in the development and performance of organisms, and some gene mutations will cause the turtle's head to turn gray. Environmental factors can also affect the color of turtles. Water pollution, insufficient or too strong light, too high or too low temperature, etc. Will affect the appearance of turtles, including the change of head color. The health of the yellow-throated turtle will also affect its head color. If the tortoise lacks enough nutrition or is in a sick state, its head color will be abnormal. The molting period is also a reason. During the molting period, the turtle's old and new skin alternate, and the color of its head will temporarily turn gray during this process.