High cholesterol (hypercholesterolemia) can be inherited, but it's often the result of unhealthy lifestyle choices, and thus preventable and treatable. A healthy diet, regular exercise and sometimes medication can go a long way toward reducing high cholesterol.
High cholesterol typically doesn't cause any symptoms. In the vast majority of cases, the only true symptoms it may cause are emergency events. For instance, a heart attack or stroke can result from the damage caused by high cholesterol over time. These events typically don’t occur until high cholesterol leads to the formation of plaque in your arteries.
"Cholesterol data differed among and between these countries, with the size of the plot circles proportional to the population size and studysize where more than one study was available within a country (Figure 7.7). Cholesterol levels were consistently lower for Japan across all age groups. The curve of best fit through these data weighted by study size within each country and by country population size within each subregion was estimated (i.e. a weighted regression line).