Hepatitis
Many viruses, for example, the virus causing mononucleosis and cytomegalovirus, can inflame the liver. Most viruses, however, do not attack primarily the liver; the liver is just one of several organs that the viruses affect.{{more}} When most doctors speak of viral hepatitis, they are using the definition that means hepatitis caused by a few specific viruses that primarily attack the liver and are responsible for about half of all human hepatitis.
There are several hepatitis viruses; they have been named types A, B, C, D, E, F (not confirmed), and G. As our knowledge of hepatitis viruses grows, it is likely that this alphabetical list will become longer. The most common hepatitis viruses are types A, B, and C.
Hepatitis viruses replicate (multiply) primarily in the liver cells. This can cause the liver to be unable to perform its functions.
The liver helps purify the blood by changing harmful chemicals into harmless ones. The source of these chemicals can be external, such as medications or alcohol, or internal, such as ammonia or bilirubin. Typically, these harmful chemicals are broken down into smaller chemicals or attached to other chemicals that then are eliminated from the body in the urine or stool.
The liver produces many important substances, especially proteins that are necessary for good health. For example, it produces albumin, the protein building block of the body, as well as the proteins that cause blood to clot properly.
The liver stores many sugars, fats and vitamins until they are needed elsewhere in the body.
The liver builds smaller chemicals into larger, more complicated chemicals that are needed elsewhere in the body.
When the liver is inflamed, it does not perform these functions well, which brings about many of the symptoms, signs, and problems associated with any type of hepatitis.
Many patients infected with hepatitis A, B and C have few or no symptoms of illness. For those who do develop symptoms of viral hepatitis, the most common are flu-like symptoms, including: loss of appetite, nausea, vomiting, fever, weakness, and abdominal pain. Dark urine, light-coloured stools, fever and jaundice are typical signs of hepatitis.
Diagnosis of viral hepatitis is based on symptoms and physical findings as well as blood tests for liver enzymes, viral antibodies, and viral genetic materials.
Treatment of acute viral hepatitis and chronic viral hepatitis are different. Treatment of acute viral hepatitis involves resting, relieving symptoms and maintaining adequate intake of fluids. Treatment of chronic viral hepatitis involves medications to eradicate the virus and taking measures to prevent further liver damage.
Dr Rosmond Adams is a medical doctor and a public health specialist. He may be emailed at adamsrosmond@gmail.com
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