Digestive illness is the single most common reason a trip to Vietnam gets interrupted. Most cases settle within a few days, but the line between "rest and fluids is enough" and "you need to be seen now" is not obvious to everyone. This article focuses on what matters most: handling the first 24 hours correctly and recognising when to get help.
Warning signs that mean you should be seen now
Go to a medical facility or call 115 IMMEDIATELY if you have: blood in your stool or black stools, vomiting blood, a persistent high fever, severe pain concentrated in one area, confusion or difficulty waking, no urine for many hours, or you cannot keep down any fluid for more than half a day. Young children, older adults, pregnant women and people with underlying conditions should seek help far sooner.
The most important thing: rehydrate correctly
In most cases of food poisoning the real danger is loss of fluid and electrolytes. How you rehydrate matters more than how much:
- Sip small amounts continuously — gulping while nauseated usually triggers more vomiting and further fluid loss.
- Use oral rehydration salts mixed exactly as directed on the sachet. Making it stronger does not make it better.
- If you have no rehydration salts, plain water with lightly salted food helps; fizzy drinks and energy drinks are not a substitute.
- Take extra fluid after each episode of diarrhoea.
- Start eating bland, easily digested food once the nausea eases — prolonged fasting does not speed recovery.
What to avoid
- Anti-diarrhoeal medication while you have a high fever or blood in your stool
- Buying antibiotics yourself without being examined — most cases do not need them
- Alcohol, coffee, milk and greasy food during the acute phase
- Pushing on with a long itinerary while dehydrated — this is how mild cases become serious
When an IV is genuinely needed
An intravenous drip is not the default option; it is for when oral fluids are no longer working — persistent vomiting that keeps nothing down, or clear signs of dehydration such as a very dry mouth, passing very little dark urine, dizziness on standing, and marked exhaustion. That decision needs a clinician to assess you in person, both for the indication and for the right type of fluid.
Be cautious of "rapid recovery" drip services offered without any examination. An IV is a medical procedure that requires a proper indication and monitoring while it runs.
Hotel visit or hospital?
| Situation | Appropriate response |
|---|---|
| Mild vomiting or diarrhoea, still able to drink | Self-care, rehydration, monitor |
| Very tired, drinking poorly, possible dehydration | Doctor visit at your accommodation, consider an IV |
| Blood, high fever, severe pain, confusion | Hospital or call 115 immediately |
Protecting the rest of your trip
- Favour food served hot and freshly cooked over dishes left standing
- Choose busy places — higher turnover means fresher ingredients
- Be careful with raw seafood and salads washed in water of unknown quality
- Wash your hands before eating; carry hand gel when out and about
- If your stomach is sensitive, consider bottled water and ice from a trusted source
If you are in Da Nang or Ho Chi Minh City and need to be seen at your hotel, apartment or homestay, Y Te Xanh (GreenCare) has English-speaking clinicians, quotes prices before starting, and issues invoices suitable for a travel insurance claim.
Need personalised advice for your loved one in Da Nang? Call our hotline 094 368 81 15 (24/7) or leave your details to book an appointment — a GreenCare nurse will contact you and provide transparent pricing before we begin.
