Causes and Risk Factors for Chronic Hepatitis B
Chronic hepatitis B is caused by the hepatitis B virus (HBV) entering the body. The virus can be transmitted through various means, including:
- Birth: When a mother with hepatitis B passes the virus to her newborn during childbirth.
- Sexual contact: Having sex with a partner who has hepatitis B.
- Sharing needles or syringes: Using contaminated needles or syringes, such as those used for drug use.
- Sharing personal items: Sharing items like toothbrushes or razors with someone who has hepatitis B.
- Direct contact with open sores or blood: Coming into contact with the open sores, wounds, or blood of someone with hepatitis B.
- Accidental contact with infected blood: Accidentally coming into contact with blood from someone who has the hepatitis B infection, such as through a sharp medical instrument.
When a person tests positive for the hepatitis B virus for more than six months after their first positive blood test, doctors consider it chronic hepatitis B. The immune system is not able to completely eliminate the virus, so it remains in the blood and liver.
The age at which a person becomes infected can also play a role in whether hepatitis B becomes chronic. The younger a person is when they contract the virus, the greater their risk of developing a chronic infection. For example, around 9 in 10 infants infected with hepatitis B will later develop chronic hepatitis B. However, most older children and adults who contract the virus will recover and not experience long-term symptoms. Approximately 5-10% of infected adults will develop a chronic infection.
It's important to note that chronic hepatitis B can lead to complications such as liver damage, liver failure, and an increased risk of liver cancer. While there are approved drugs available to help control the virus and reduce the risk of more serious liver disease, there is currently no complete cure for chronic hepatitis B.
Non-modifiable risk factors for chronic hepatitis B include:
- Age: Young children and older adults are at increased risk of hepatitis B infection developing into chronic hepatitis B.
- Sex assigned at birth: Males may be at higher risk for developing chronic Hepatitis B.
- Genetics: Genetic predisposition is another non-modifiable risk factor for chronic hepatitis B. Having a positive family history of liver cancer or a family history of chronic hepatitis B may increase an individual's risk of developing the disease.
- Receiving chemotherapy for cancer.
- Immunocompromised individuals (people with weakened immune systems).
It's important to note that these non-modifiable risk factors cannot be changed or controlled by an individual. However, there are modifiable risk factors individuals can take steps to address.
There are several modifiable risk factors that can increase the likelihood of developing chronic hepatitis B. Modifiable risk factors are those that can be changed or controlled through health behavior choices. Let's explore these risk factors in more detail:
- Alcohol Use: Excessive alcohol consumption can increase the risk of developing chronic hepatitis B. In addition to injuring the liver with heavy use, alcohol weakens the immune system and makes it harder for the body to fight off infections, including Hepatitis B. It is important to limit alcohol intake to reduce the risk of complications.
- Tobacco Use: Smoking tobacco is another modifiable risk factor for chronic hepatitis B. Smoking weakens the immune system and can make it harder for the body to fight off infections. Quitting smoking can help reduce the risk of developing complications.
- Obesity: Obesity, which is often measured as having a high Body Mass Index (BMI) is also a modifiable risk factor for chronic hepatitis B. BMI is a measure of body fat based on height and weight. A high BMI indicates excess weight, which can lead to fatty liver disease, which increases the risk of hepatitis B infection becoming chronic hepatitis B.
- In addition to risk factors for hepatitis B infection progressing to chronic hepatitis B, there are also modifiable risk factors for hepatitis B infection in the first place. These include:
- Unsafe sex practices (e.g., not using a condom): Hepatitis B infection can be transmitted via sexual contact
- Intravenous drug abuse: Hepatitis B infection can be transmitted via dirty needles.
It's important to note that these modifiable risk factors do not cause chronic hepatitis B directly, but they can contribute to progression to chronic disease and increase the likelihood of complications. By addressing these risk factors through lifestyle changes such as reducing alcohol consumption, quitting smoking, and maintaining a healthy weight, individuals with chronic hepatitis B can reduce their risk of liver damage and improve their overall health.
To prevent or reduce the chances of getting chronic hepatitis B, there are several actions a person can take to reduce the risk of hepatitis B infection:
- Get vaccinated: The hepatitis B vaccine is the most effective way to prevent infection. It is recommended for all infants, unvaccinated children under the age of 19, adults ages 19 to 59, and adults over the age of 60 who are considered high risk. If you think you may have been exposed to hepatitis B, talk with a doctor about getting a hepatitis B shot.
- Practice safe sex: Use barrier methods, like condoms, during sexual activity to reduce the risk of transmission.
- Avoid sharing needles and medical equipment: Hepatitis B can be transmitted through sharing needles, syringes, and medical equipment. It's important to never share these items to prevent infection.
- Avoid sharing personal items: Items such as razors and toothbrushes can also transmit hepatitis B. It's best to avoid sharing these items with others.
- Practice good hygiene: Wash your hands thoroughly with soap and water after potential exposure to blood or other bodily fluids.
- Sterile needles for body art, piercings and acupuncture.
- Cover all wounds and cuts.
Remember, these actions can help reduce the risk of hepatitis B infection and chronic hepatitis B, but it's always a good idea to consult with a healthcare professional for personalized advice and guidance.