Dr Kieron Lim
Senior Consultant Gastroenterologist
MBBS (University of London), MRCP (UK), FRCP (Edinburgh), FAMS (Gastroenterology)
Gastroenteritis, often referred to as "stomach flu" or "food poisoning," is an inflammation of the stomach and intestinal lining. It manifests through symptoms like vomiting, diarrhoea, nausea, and abdominal pain. This illness is typically triggered by bacterial or viral infections; and it may also be induced by exposure to certain chemicals. While generally not severe for healthy individuals, gastroenteritis can lead to dehydration and may cause more severe symptoms.
Gastroenteritis arises from the immune system's inflammatory response in the stomach and intestines to combat infections, such as:
Viruses such as norovirus, rotavirus, and adenovirus are common causes of viral gastroenteritis, especially in children.
Bacteria like Escherichia coli (E. coli), Salmonella, Campylobacter, and Shigella can lead to bacterial gastroenteritis, often resulting from contaminated food or water.
Parasites like Giardia lamblia and Cryptosporidium can cause gastroenteritis, typically through ingestion of contaminated food or water.
Gastroenteritis is typically transmitted through:
Consuming food or water contaminated with viruses, bacteria, or parasites can lead to gastroenteritis.
Direct contact with an infected person, such as sharing utensils, food, or personal items, can transmit gastroenteritis.
Improper handwashing after using the restroom or before handling food can contribute to the spread of gastroenteritis.
Touching surfaces or objects contaminated with infectious agents and then touching the mouth or face can transmit gastroenteritis.
The symptoms of gastroenteritis are usually mild and resolve within 1-2 days, although in some instances, they may persist for up to 10 days. These symptoms commonly include:
However, in rare instances, these symptoms can lead to dehydration and more severe complications. Prompt medical attention is necessary if you experience more serious symptoms such as:
Gastroenteritis is typically diagnosed based on symptoms, activity history and medical history. In some cases, laboratory tests may be conducted, such as stool tests to detect bacteria, viruses, or parasites. Additionally, a physical examination may be performed to assess symptoms and rule out other conditions.
Gastroenteritis treatment focuses on relieving symptoms and preventing dehydration. This may include:
Drinking plenty of fluids, such as water, oral rehydration solutions, or clear broths, to replace lost fluids and electrolytes due to vomiting and diarrhoea.
Gastroenteritis medicines may help alleviate symptoms of diarrhoea and nausea, as well as to fight against the infection.
Gradually reintroduce bland, easy-to-digest foods like rice, bananas, toast, and applesauce once vomiting and diarrhoea have subsided. It is advisable to avoid spicy, fatty, or irritating foods that can exacerbate gastrointestinal symptoms.
Preventing gastroenteritis involves practising good hygiene and food safety measures to reduce the risk of infection. Here are some preventive measures:
Wash hands frequently with soap and water, especially after using the bathroom, changing diapers, and before preparing or eating food.
Ensure proper food handling, storage, and preparation. Cook foods thoroughly, avoid cross-contamination between raw and cooked foods, and refrigerate leftovers promptly.
Drink safe and clean water from reliable sources. Use boiled or filtered water if unsure about its quality, especially while travelling to areas with poor sanitation.
Avoid sharing utensils, towels, or personal items with individuals who are sick. Stay home from work or school if experiencing symptoms of gastroenteritis to prevent spreading the infection to others.
Depending on the cause of gastroenteritis, vaccines may be available to prevent certain types of viral or bacterial infections.
Frequently Asked Questions (FAQs)
Meet Our Gastroenterologist
Dr Kieron Lim
MBBS, University of LondonMember, Royal College of Physicians (UK)Fellow, Academy of Medicine (Gastroenterology) SingaporeFellow, Royal College of Physicians (Edinburgh)
Dr Kieron Lim is a senior consultant in Gastroenterology and Hepatology. With decades of specialist experience, he holds various leadership roles at Mount Elizabeth Hospital and is the Vice-Chair of the Chapter of Gastroenterologists at the Academy of Medicine in Singapore. Dr Lim graduated from St Bartholomew’s and The Royal London School of Medicine (UK) and completed his fellowship training at the Recanati/Miller Transplantation Institute, Icahn School of Medicine, Mount Sinai New York, USA. He was formerly the Head of the Division of Gastroenterology and Hepatology at the National University Hospital and has actively contributed to the research and advancement of the field.