They give info and treat as best they can. My sister's mother in law, a Latina had health care and prescriptions for high blood pressure that she put in the drawer and refused to take, despite objections from her family. She died of complications of high blood pressure, in an anglo society, and she was the only Latina in her immediate family. She married a caucasion. One of the frustrations of health care professionals is that they can't get people to use the care.
Most people have medical, or free care, or insurance.
We are taught to work with culture. For example some cultures eat only rooster during pregnancy and chicken and rice soup after. We can't change their diet as many attempts have been made. Many are amenable to taking a vitamin and mineral supplement, some are not. So, we know what we are dealing with at least.