Stomach flu teleconsult in Singapore
Stomach flu (viral gastroenteritis) is the most common cause of sudden diarrhoea and vomiting in Singapore. It is usually self-limiting and settles within 24 to 72 hours with rest and oral rehydration. A teleconsult is well-suited to mild-to-moderate episodes when you can still drink fluids and are not showing signs of dehydration.
What is stomach flu?
Stomach flu — properly called viral gastroenteritis — is an infection of the lining of the stomach and intestines. Despite the name, it has nothing to do with influenza. The most common viruses in Singapore are norovirus (the cause of most adult outbreaks, especially on cruise ships, in food courts and at school camps), rotavirus (the leading cause in young children), and adenovirus. Bacterial gastroenteritis — Salmonella, Campylobacter, Shigella, E. coli — is less common but more severe and often follows contaminated food.
Typical onset is sudden: nausea and vomiting first, followed within hours by watery diarrhoea, low-grade fever and crampy abdominal pain. Most adults recover in 24 to 72 hours. The biggest risk is dehydration — particularly in young children, elderly patients and those with diabetes or kidney disease. Norovirus outbreaks tend to spike during cooler months (December to February) in Singapore.
What commonly causes it
- Norovirus — the commonest adult cause; spreads explosively through food courts, schools, camps
- Rotavirus — the leading cause in young children; preventable with childhood vaccination
- Adenovirus and astrovirus — milder, often in children
- Bacterial food poisoning — Salmonella (eggs, chicken), Campylobacter (poultry), Vibrio (seafood)
- Toxin-mediated food poisoning — Staphylococcus aureus, Bacillus cereus (commonly from re-heated rice)
- Contaminated water or ice during travel (travellers’ diarrhoea)
When teleconsult may be suitable
- Sudden onset diarrhoea or vomiting in an otherwise well adult
- Mild-to-moderate symptoms with intact oral intake
- Cramps, nausea, bloating or low-grade fever without warning signs
- Need for an MC, oral rehydration advice or anti-nausea medication
- Suspected food poisoning where the food source is known and recent
When to seek in-person care
- Blood in stools, black or tarry stools, or persistent severe abdominal pain
- Vomiting so persistent that you cannot keep down any fluids for 12+ hours
- Signs of dehydration: dizziness on standing, very little urine, dry mouth and tongue, sunken eyes
- Confusion, severe weakness, or fainting
- Fever above 39°C with profuse bloody diarrhoea (suggests bacterial dysentery)
- Symptoms in infants under 6 months, pregnancy, dialysis patients or significant immune compromise
What to tell the doctor
- Count diarrhoea and vomiting episodes over the last 24 hours
- Check whether you are still producing urine (a rough hydration marker)
- Share the last food you ate and whether anyone else has the same symptoms
- Note any travel in the previous 2 weeks
- Have your medication list and drug allergies ready
What you can safely do at home
- Oral rehydration salts (Hydralyte, Pedialyte) or diluted 100Plus 1:1 with water — sip 100 ml every 10 minutes
- Avoid plain water alone — it does not replace electrolytes lost in stool
- BRAT diet for the first 24 hours — bananas, rice, applesauce, toast — then resume normal foods
- Avoid dairy, fruit juice and caffeine until stools normalise
- Stay home for at least 48 hours after the last episode of diarrhoea or vomiting (norovirus is highly contagious)
- Wash hands with soap and water (alcohol hand-rub does not inactivate norovirus)
What the doctor will ask
- Number and pattern of diarrhoea and vomiting episodes; can you keep fluids down
- Presence of blood, mucus or black colour in stools; severity and location of pain
- Recent meals (shared meals, restaurants, hawker), travel, sick contacts
- Pregnancy possibility, age, diabetes, kidney disease, immunosuppression
- Current medication and recent antibiotic use (raises C. difficile risk)
Frequently asked questions
How long does stomach flu last in Singapore?
Most adult cases of viral gastroenteritis settle in 24 to 72 hours; children may take 5 to 7 days. Symptoms lasting beyond 4 days, returning after initial recovery, or with bloody stools or high fever should be re-assessed in person — they may be bacterial or due to another cause.
Should I take Imodium (loperamide) for stomach flu?
Loperamide is safe and helpful for watery diarrhoea without fever or blood. Avoid it when there is bloody diarrhoea, high fever or suspected bacterial dysentery (Shigella, severe Salmonella) — slowing the gut can prolong infection. When in doubt, consult a doctor before using it.
How do I know if I am dehydrated?
Warning signs include dizziness on standing, very little or dark urine (less than 4 times in 24 hours), dry mouth and lips, sunken eyes, slow skin recoil when pinched, and feeling weak. Significant dehydration usually needs IV fluids in a clinic or A&E.
Can stomach flu be prevented?
Norovirus spreads through contaminated food, water and surfaces — wash hands with soap (not alcohol gel) before eating, especially after using the toilet. Avoid sharing utensils with someone who is unwell. Rotavirus vaccination is recommended in Singapore’s National Childhood Immunisation Programme for infants.
When should I head to A&E instead of a teleconsult?
Go to A&E for bloody or black stools, severe abdominal pain, persistent vomiting preventing any oral intake, confusion, very low urine output, fainting, or symptoms in an infant under 6 months. Pregnancy with dehydration risk also needs in-person review.