Fever in Vietnam: What a Doctor Checks and When Not to Wait

A fever in Vietnam is most often an ordinary viral illness, a throat infection, or a stomach upset, but dengue fever must be ruled out early. During a room visit, a doctor checks your vital signs, examines your chest, abdomen, and skin, and carries out rapid or laboratory tests. You should see a doctor if your fever lasts more than two days or stays above 39 degrees despite paracetamol. Warning signs like trouble breathing, continuous vomiting, or bleeding mean going to a hospital emergency department or calling 115 immediately.

What a doctor asks first

When you contact a doctor, the assessment begins before anyone steps into your room.

First comes how many days the fever has lasted and how it started: suddenly with shivering, or slowly over several days.

You will then be asked about other symptoms:

• Sore throat, cough, or runny nose.
• Burning when passing urine, or pain in the back.
• Diarrhea or vomiting.
• A rash or small red spots on your skin.
• A bad headache, pain behind the eyes, or aching muscles and joints.

Questions follow about mosquito bites, where you have been (city, beach, jungle, caves, or farms), contact with animals, and whether someone travelling with you is sick too. Finally, you describe what you have already taken, including painkillers and leftover antibiotics. The doctor checks your medical history, allergies, and, for women, if you could be pregnant.

What is checked in the room

First, your vital signs are checked: temperature, pulse, blood pressure, oxygen level, and breathing rate.

You then have your throat and ears examined, your chest listened to with a stethoscope, your belly checked, and your skin inspected for a rash or small red spots.

Hydration is assessed by checking your tongue, pulse rate, and blood pressure lying down and standing if you feel dizzy. If you have a bad headache, your neck is checked to confirm it is not stiff.

Tests that can be done at your hotel

Some tests give an answer in your room. Others need a lab.

A rapid flu test is done on the spot and gives a result in a few minutes.

Blood is drawn in your room for dengue tests (NS1 and antibodies) and a full blood count. The tubes go to a lab, and results come back as a PDF in about one to three hours.

A malaria test is only needed if you have been in forest areas.

What the fever usually turns out to be

Most fevers in travellers turn out to be a viral illness such as flu or a cold. Other common causes are a throat or tonsil infection, a gut infection, and a urinary infection.

Dengue is another common cause that must be ruled out early. You can read more about its symptoms and care on our dengue fever page.

In the visits our team handled in Da Nang and Ho Chi Minh City this autumn, the answers ranged from flu to a fever with negative flu and dengue tests, treated as a viral illness, to confirmed dengue. The next section describes two of them.

Malaria and typhoid fever are much less common, covered in our guides to malaria and typhoid fever. If you are travelling with a sick child, different care thresholds apply, as outlined in our guide for a child with a fever.

A real visit: fever, headache and a positive dengue test

In early October, a man of about 30 staying at a hotel in Da Nang asked for a doctor because of fever, headache and tiredness. On the first check his pulse was above 110. His skin was dry, with no rash and no small red spots, and his chest, belly and alertness were normal. The dengue NS1 rapid test came back positive that evening, and the diagnosis was dengue with dehydration.

He was treated in his room with fluids and paracetamol through a drip, with a vitamin added, and oral rehydration salts to drink through the day. The written advice was to rest in a cool, ventilated place, keep drinking, and seek help at once for severe belly pain, repeated vomiting, unusual bleeding, drowsiness, difficulty breathing, cold hands and feet, very little urine, dizziness or fainting. His wife asked for the same test, then decided against it; she was told to do it if a fever started. In the following days he asked for a blood count and then for a second visit, and his medical report covers five days of care. We do not have a record of how he felt afterwards.

Another traveller, seen in Ho Chi Minh City in late September with fever, aching muscles and headache, had already been tested for flu and dengue at a hospital that day, and both were negative. The doctor still examined them in the room and treated a probable viral illness with fluids.

What helps while you wait, and what to avoid

Drink small amounts often: water, oral rehydration solution, and soup. Rest in a cool room, wear light clothes, and use a fan rather than taking a cold shower.

Paracetamol as written on the packet is fine.

Do not take ibuprofen and do not take aspirin until dengue has been ruled out. If you have dengue, these medicines increase the danger of internal bleeding.

Do not start leftover antibiotics. They do nothing for a virus, and they hide the clinical picture from your doctor.

If your fever lasts more than two days, or stays above 39 degrees despite paracetamol, a doctor should see you.

Signs that mean hospital, not the hotel

Some signs indicate severe illness that cannot be treated in a hotel bedroom.

Pregnant women, and people with weak immunity, heart disease, or kidney conditions, go to hospital earlier. At those signs, we send patients to the hospital emergency department; we do not treat that at the hotel.

If a doctor can come to you

If you do not have emergency symptoms and prefer to stay in bed, a licensed doctor can come to your hotel room or villa. You can request a visit through our booking form. The doctor conducts the examination and collects any needed laboratory tests right in your room.