Health inequalities can be defined as the differences in health status amongst an entire population. There are many different factors that contribute to the status of ones health.
One example of a health inequality would be the difference in incomes. Someone who makes more money year round can afford pricey treatments and doctor bills, while someone who doesn't bring in as much money yearly may not be able to afford treatment or general healthcare.
Another example would be ones general mobility. People who don't live near a doctors office or hospital may not be able to be able to make it in to appointments, while people who live in a city can walk or drive to appointments.
First of all GDP refers to Gross Domestic Product. The lower the GDP the worse the health of the general public actually is. In the world, the United States is 2nd in GDP. Also compared to other countries similar to the United States, our GDP is very low.
Many other countries with low GDPs struggle because a lot of the population is at risk to disease and death due to poor health conditions. An example of this, would be people living in poverty in Africa unable to access safe drinking water, proper health care, etc.
What surprised me the most was the fact that in the United States, we have one of the highest GDP's, however our all around health level is quite low.