The spoken language varies from region to region

What makes communication difficult in China for members of various Chinese ethnic groups is the variation in spoken language from region to region.

China is a vast country with a diverse population of different ethnic groups, each with its own unique language or dialect. This variation in spoken language across regions can pose a significant challenge in communication. Even though all these languages or dialects fall under the umbrella of "Chinese," the differences can be substantial, making mutual understanding difficult.