What is Hepatitis A? Causes, Symptoms, and How It Spreads 

Introduction 

Hepatitis A is a viral disease that affects the liver¹. It is a significant health concern globally, including in India, where its prevalence has been reported to range between 2.1% and 52.5%². 

Hepatitis A is caused by infection with the hepatitis A virus (HAV), which is usually spread through the faecal-oral pathway. Although common in children, with improved sanitation conditions in some parts of India, fewer kids are now getting exposed to hepatitis A at an early stage, making teens and adults more vulnerable to this infection³.   

Hepatitis A disease can range from a mild illness with few or no symptoms to severe cases in some. It is more commonly seen in low- and middle-income countries, such as sub-Saharan Africa, South Asia, Asia, Latin America, Eastern Europe, and the Middle East^1,4. 

In this article, we will understand what hepatitis A is, its symptoms, transmission, management, and prevention. 

What is Hepatitis A?

Hepatitis A is a viral infection that causes inflammation of the liver. Unlike other types of hepatitis (B and C), which may cause chronic disease, cirrhosis, or even hepatocellular carcinoma, hepatitis A does not lead to long-term (chronic) infections. However, hepatitis A infection can still present with mild symptoms to severe illness. In rare situations, it can even lead to acute liver failure (more likely in the elderly with underlying health conditions)⁴. 

It is important to note that there a change in the susceptibility trend of this infection with improving hygiene conditions across the country, affecting more of older children and adults, who often experience severe illness³. 

Causes of Hepatitis A

Is hepatitis A viral disease?  

Yes, hepatitis A is caused by a hepatotropic virus, meaning it mainly targets the liver cells (hepatocytes). It is a small, spherical, non-enveloped virus which is roughly 27 to 32 nanometres in diameter. It contains single-stranded RNA as its genetic material, along with specialised structures that enable it to infect liver cells and replicate within them⁴. 

How Hepatitis A Spreads  

Wondering how is hepatitis A spread? Let us see! 

Hepatitis A is mainly spread through: 

• Faecal-oral route: The most common mode of transmission; occurs when a person consumes food contaminated with faeces (stool) from an infected individual⁵. 
• Close physical contact: The virus can spread through activities like oral-anal sex with an infected person or through close personal care of an infected person^1,4. 
• Poor hygiene during food handling: In households, this often happens when an infected person prepares food without proper handwashing¹. 
• Contaminated water: Waterborne outbreaks (more common in areas with inadequate snatitation) can occur due to sewage-contaminated or improperly treated drinking water¹. 

Note: Everyday interactions or casual contact with an infected person usually do not transmit the virus⁵. 

Signs and Symptoms of Hepatitis A

Hepatitis A infection can lead to a wide spectrum of symptoms, ranging from very mild to quite severe. However, many cases (particularly among children) may have no signs and symptoms of hepatitis A. 

When symptoms do occur, they typically appear 2 to 6 weeks after you have been exposed to the HAV and can include^1,4,5:

• Fatigue 
• Fever 
• Loss of appetite 
• Nausea and vomiting 
• Abdominal pain (especially near the liver) 
• Dark urine (due to reduced bile flow or inability to process bilirubin)  
• Pale stools  
• Jaundice (yellowing of the skin and eyes) 

Recognising the early signs and symptoms of hepatitis A can help in timely diagnosis and treatment. 

At-Risk Groups for Hepatitis A

Certain groups of people are more likely to get infected with hepatitis A or to experience more severe illness. These include: 

• International Travellers: People travelling from low-risk areas to countries where hepatitis A is more common are at high risk, especially if unvaccinated¹. 
• Men Who Have Sex with Men (MSM): HAV can spread through close physical contact, and several outbreaks have occurred in this group due to sexual transmission⁴. 
• People Who Use Drugs: Both injecting and non-injecting drug users are at higher risk due to poor hygiene, shared equipment, and contaminated environments⁶. 
• Individuals Experiencing Homelessness: Limited access to clean water, sanitation, and healthcare increases the risk of infection and severe outcomes⁶. 
• Individuals Living in Close Contact with Infected People: Includes those who live with or care for someone who has hepatitis A, or care for a child recently adopted from a country where the infection is common⁷. 
• People with Chronic Liver Diseases: Those with hepatitis B or C, alcoholic liver disease, or HIV may experience more severe illness or liver failure if infected with HAV⁶. 

Diagnosis and Tests for Hepatitis A

Hepatitis A diagnosis cannot be based on symptoms alone, as it looks similar to other types of viral hepatitis. Laboratory testing methods (mentioned below) are essential for accurate hepatitis A diagnosis: 

• Anti-HAV IgM Test: This is the main test used to detect acute infection. IgM antibodies appear just before the start of symptoms (about 5 to 10 days before) and remain high for about a month. They typically disappear within six months. However, false positives can occur (especially after recent vaccination), so the test should be used only when there is a strong clinical suspicion⁶. 
• Anti-HAV IgG Test: These antibodies appear shortly after IgM and stay in the body for life. Their presence means the person has had a past infection or has been vaccinated⁶. 
• HAV RNA Tests (Nucleic Acid Amplification Tests): These are not commonly used but can detect the virus’s genetic material in blood or stool. They are helpful in confirming infection and tracing the source during outbreaks⁶.
• Liver function tests (LFTs): These are commonly used to assess suspected hepatitis. Elevated levels of alanine transaminase (ALT) and bilirubin, in particular, support the diagnosis and help assess the severity of infection⁸. 

Lately, I’ve been seeing in my clinical practice there’s a clear shift in case demographics, and I’ve had to consciously start keeping HAV in the differential when adults come in with hepatitis-like presentations. The clinical patterns are definitely changing, and my own diagnostic approach has had to evolve along with them. ALT/AST levels are usually very high >1000 and IgM anti HAV antibody and HAV DNA PCR tests are often needed. 

Dr. Vishesh Bharucha, MBBS, MD

Complications of Hepatitis A

“Is hepatitis A dangerous”? The answer to this is yes, for some it can be dangerous. While hepatitis A is usually self-limiting, it can occasionally cause serious liver complications, particularly in certain high-risk groups.  

Possible hepatitis A complications include: 

• Relapsing hepatitis: Some individuals (occurs in around 10% patients) may feel better, and then experience a return of symptoms (milder than initial illness) after sometime (usually within 6 months)^4,9.  
• Cholestatic hepatitis: A rare condition (occurs in less than 5% patients) where jaundice and itching persist for an extended period (lasts upto 3 months) due to bile duct injury and resolves without any chronic liver damage^4,9. 
• Fulminant hepatitis: A very rare but severe hepatitis A complication leading to sudden liver failure, which can be life-threatening (more likely in elderly patients or those with chronic liver disease)⁴. 
• Death: Rare, but can occur, particularly in people with other liver conditions⁴. 

Thus, understanding when and how hepatitis A is dangerous emphasises the importance of prevention and timely medical care in managing this infection. 

Treatment and Management Options for Hepatitis A

Many people ask, can hepatitis A be cured? The answer is yes; most people recover fully without needing specific antiviral treatment⁵.  

Key aspects in managing hepatitis A infection include: 

• Rest: Fatigue is common, so adequate rest helps the body recover¹. 
• Hydration: Drinking plenty of fluids is important to prevent dehydration, especially if nausea, vomiting, or diarrhoea is present^3,5. 
• Nutrition: Eating light, balanced meals can support healing, even if appetite is reduced¹⁰.
• Supplementation: Supplementation with vitamins such as the following may be beneficial in restoring immune function in patients recovering from viral hepatitis A¹¹. 
  • Vitamin C  
  • B-complex (including B3, B6, and B12)  
• Avoiding painkillers: Medications such as paracetamol (if taken in high doses) can damage the liver further and should be avoided during recovery. Thus, take any pain medications only under medical supervision¹. 
• Regular checkups: Monitoring liver enzymes and bilirubin levels regularly can help indiviuals with symptomatic or prolonged liver illness. 

Note: The typical hepatitis A recovery time can last a few months, although most people begin to feel better within a few weeks¹. The good news is that while the hepatitis A recovery time varies, most individuals fully recover without any long-term liver damage. 

How to Prevent Hepatitis A

Understanding how to prevent hepatitis A can help reduce the spread of the virus in communities, these include: 

• Vaccination: It is the most effective way to protect against hepatitis A. It’s recommended for children, travellers to high-risk areas, and high-risk groups (mentioned above)¹².  
• Safe food and water: Avoid raw or undercooked food and drink only clean or bottled water, especially when travelling⁴. 
• Hand hygiene: Wash hands thoroughly with soap and water after using the toilet, changing diapers, and before preparing or eating food¹. 
• Improved sanitation: Access to clean water and proper sewage systems reduces the risk of outbreaks.¹ 
• Protection during sex: Use condoms and dental dams, especially during oral-anal contact. Additionally, post-exposure prophylaxis with the hepatitis A vaccine or immunoglobulin is recommended for individuals who have had close contact with a confirmed case^1,4. 

Note: Public health campaigns that focus on the prevention of hepatitis A through awareness and immunisation can also be a good strategy. 

Hepatitis A is a growing but quiet problem in India. Many people don’t realise how common it is because it often spreads silently before symptoms appear. The good news is that it’s one of the easiest diseases to prevent with a vaccine. It needs just one dose, it gives long-lasting protection, and India already has its own locally made vaccine, which can be used widely for everyone.

Dr. Vishesh Bharucha, MBBS, MD

When to See a Doctor

You should seek medical attention if you experience any symptoms suggestive of hepatitis A, especially^4,7: 

• Jaundice 
• Dark-coloured urine or pale stools 
• Persistent fatigue or weakness 
• Severe abdominal pain  
• Severe itching or rash 

Note: Symptoms like confusion, drowsiness, or changes in mental status could indicate serious liver complications such as hepatic encephalopathy or liver failure, which are considered as emergency and require immediate medical attention. 

Conclusion

Hepatitis A is an avoidable viral infection that is usually self-limiting and resolves without long-term complications. Awareness of how hepatitis A is spread can reduce the risk since it typically occurs through the ingestion of contaminated substances. Additionally, timely diagnosis and supportive care are essential for managing symptoms and avoiding severe outcomes. Since hepatitis A doesn’t cause long-term infection, the answer to “Can hepatitis A be cured” is reassuring; yes, most people recover completely! 

Rare complications such as fulminant hepatitis might still occur (especially in older adults or those with chronic liver disease). This make vaccination the most effective method for the prevention of hepatitis A, complemented by good hygiene practices and safe food and water consumption. Maintaining these preventive measures along with monitoring complications and identifying high-risk groups is crucial to reduce the spread of infection and safeguard public health. 

Also Read: Everything You Need to Know About the Hepatitis A Vaccine

Frequently Asked Questions (FAQs)

References

1. World Health Organization. Hepatitis A [Internet]. World Health Organization; [cited 2025 May 28]. Available from: https://www.who.int/news-room/fact-sheets/detail/hepatitis-a 

2. Kumar D, Peter RM, Joseph A, Kosalram K, Kaur H. Prevalence of viral hepatitis infection in India: A systematic review and meta-analysis. J Educ Health Promot. 2023 Mar 31;12:103. Available from: https://pubmed.ncbi.nlm.nih.gov/37288405/ 

3. Mathur P, Arora N. Epidemiological transition of Hepatitis A in India: Issues for vaccination in developing countries. Indian J Med Res. 2009;128:699–704. Available from: https://www.researchgate.net/publication/24044039_Epidemiological_transition_of_Hepatitis_A_in_India_Issues_for_vaccination_in_developing_countries 

4. Girish V, Grant LM, John S. Hepatitis A [Internet]. StatPearls Publishing; [cited 2025 Jun 4]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK459290/ 

5. World Health Organization. Hepatitis A [Internet]. World Health Organization India; [cited 2025 May 28]. Available from: https://cdn.who.int/media/docs/default-source/searo/india/health-topic-pdf/factsheet-a-hepatitisday2016.pdf?sfvrsn=e6953225_2 

6. Migueres M, Lhomme S, Izopet J. Hepatitis A: Epidemiology, High-Risk Groups, Prevention and Research on Antiviral Treatment. Viruses. 2021 Sep 22;13(10):1900. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC8540458/ 

7. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Hepatitis A [Internet]. National Institutes of Health; [cited 2025 May 28]. Available from: https://www.niddk.nih.gov/health-information/liver-disease/viral-hepatitis/hepatitis-a 

8. Lala V, Zubair M, Minter DA. Liver Function Tests [Internet]. StatPearls Publishing. 2025 Jan; [updated 2023 Jul 30; cited 2025 Jun 9]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK482489/ 

9. Lai M, Chopra S. Hepatitis A virus infection in adults: epidemiology, clinical manifestations, and diagnosis. UpToDate [Internet]. Waltham, MA: UpToDate; 2024 Dec 12 [cited 2025 Jun 5]. Available from: https://www.uptodate.com/contents/hepatitis-a-virus-infection-in-adults-epidemiology-clinical-manifestations-and-diagnosis 

10. Centers for Disease Control and Prevention. Clinical Care of Hepatitis A [Internet]. Centers for Disease Control and Prevention; [cited 2025 May 28]. Available from: https://www.cdc.gov/hepatitis-a/hcp/clinical-care/index.html 

11. Centers for Disease Control and Prevention. Hepatitis A Prevention and Control [Internet]. Centers for Disease Control and Prevention; [cited 2025 May 28]. Available from: https://www.cdc.gov/hepatitis-a/prevention/index.html 

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