Only a few decades ago, people tended to expire much earlier due to bad health. They often died of diseases that today can be prevented, or some of the symptoms can be mitigated to make them survivable. Rather than focusing on treating many health issues, most doctors recommend lifestyle choices that prevent a disease from occurring. The modern illness prevention methods come in many forms and they can include inoculation, healthy diet, exercise and even exposure.

Many of the symptoms of illness begin in childhood, so that is one of the main areas where physicians focus their efforts. Childhood inoculations have become common in most advanced societies, and educating parents about helping their children form healthy living habits is part of the program. For adults, making changes to their lifestyles is often the key to a longer life and better health. Those who do contract illnesses are now taught to see a medical professional as soon as they notice symptoms.