What is the ethnicity barrier in health and social care?

I belive that in health and social care, the ehtnicity and the beliefs and traditions that people of that ethnicity uphold or without a doubt follow are what sometimes become barriers. This is basically because there are some practices or beliefs that go againts the scientific principles involved in health social care. They may not believe them and so may not approve of some health care practices that their ethnicity will be agiants with.