Health is on an individual level. A person can be healthy (not sick, not obese, not injured), while living in an unhealthy community. Public health is more of an overall entity. It deals more on the overall scale from the community, to the region, to the country, to the world. A public health concern deals with things like smoking. Governments come up with public health policies to attempt to make people healthier overall. Individuals can have poor health in a community with overall good health and vice versa.
Obviously, doing things that impact public health can have an impact on more people that doing things that are in the interest in an individual's health. Providing clean drinking water to the more than one billion people who lack access to that is a public health initiative. An individual going to the doctor to get medicine for a respiratory infection is a personal health issue.
http://www.health.state.nm.us/PHD/Dist3/Graphics/PublicHealthFamily.jpg
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