High blood pressure is sometimes called the "silent killer" because there are no symptoms. another disease that often goes unnoticed is heart disease. the first signs of a heart attack are not always obvious. diabetes is yet another illness that many do not know they have. in fact, the msn web page says that 16 million people are "silently at risk" for diabetes. what is the main idea of the passage?
-what you don't know won't hurt you -heart disease is a common and serious health problem.
-some serious medical conditions often go unnoticed.
-heart disease and diabetes are two serious health problems that often go undetected.
-sixteen million people are at risk for diabetes