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Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
![The wolf spider, Lycosa godeffroyi, is common in many areas of Australia. In this family of spiders,](https://biology-forums.com/gallery/47/medium_27605_22_04_12_6_41_34.jpeg)
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