Fever That Will Not Go Away? Dengue, Typhoid, Malaria and the Tests Your Doctor May Order
A fever that lasts one day is usually nothing to worry about. A fever that drags on for two or three days, comes back every evening or arrives with severe body pain is different. In coastal Karnataka, where heavy rains, standing water and humid weather create ideal conditions for mosquitoes and waterborne infections, persistent fever is a common reason to see a doctor, especially in the months after the monsoon.
This guide explains the most common causes of prolonged fever, the blood tests doctors often use to find the cause, the warning signs that need urgent care and how to protect your family. It is meant to help you have an informed conversation with your doctor, not to replace one.
When Should You Get a Fever Checked?
As a general rule, see a doctor if fever lasts more than two to three days, or sooner for infants, older adults, pregnant women and people with diabetes, heart, kidney or lung conditions. Do not wait if the fever comes with any warning sign listed later in this article.
Common Causes of Prolonged Fever
Viral fever
Many fevers are caused by common viruses and settle with rest, fluids and symptom care under medical guidance. Doctors still look for other causes if fever persists or the patient looks very unwell.
Dengue
Dengue is spread by Aedes mosquitoes, which commonly breed in clean, stagnant water in containers, tyres, coconut shells, flower pots and roof gutters. It often causes sudden high fever, severe headache, pain behind the eyes, body and joint pain, nausea and sometimes a rash. Doctors monitor blood counts closely, because platelets and other values can change.
Malaria
Malaria is spread by Anopheles mosquitoes and may cause fever with chills and sweating, headache and weakness, sometimes in a repeating pattern. Coastal and urban areas with construction sites and stagnant water can be at risk. It needs prompt testing and treatment.
Typhoid and other waterborne infections
Typhoid is caused by bacteria spread through contaminated food or water. It usually causes a prolonged, gradually rising fever, with headache, weakness, stomach discomfort and sometimes constipation or diarrhoea.
Leptospirosis
This infection can follow contact with water contaminated by animal urine, such as walking through floodwater or working in wet, muddy conditions. It can cause fever, muscle pain and red eyes. Tell your doctor if you have recently waded through floodwater.
Other causes
Urinary tract infections, chikungunya, influenza, chest infections, hepatitis and other conditions can also cause fever. This is why testing and a proper examination matter.
Blood Tests Commonly Used to Find the Cause
The right tests depend on your symptoms, how many days you have had fever and your doctor’s judgement. Common examples include the following.
- Complete blood count (CBC), which checks white cells, haemoglobin and platelets and gives a first picture of infection.
- Dengue tests, such as NS1 antigen in the first days of illness and antibody tests later, along with platelet monitoring as advised.
- Malaria tests, such as a blood smear or rapid antigen test.
- Typhoid tests, including blood culture in many cases. Some older antibody tests have limitations, so your doctor will advise which is suitable.
- Liver and kidney function tests, to check how the body is coping.
- Urine tests, when a urinary infection is possible.
- Other tests, such as for leptospirosis or chikungunya, if the history suggests them.
Timing matters. Some tests work best in the early days of fever and others later, so tell your doctor exactly when the fever began.
Warning Signs That Need Urgent Medical Care
- Severe or persistent stomach pain.
- Repeated vomiting or being unable to drink fluids.
- Bleeding from the gums or nose, black stools or vomit with blood.
- Extreme weakness, drowsiness, confusion or restlessness.
- Rapid breathing or difficulty breathing.
- Cold, clammy skin, pale or blue lips, or very little urine.
- Severe headache, stiff neck or a seizure.
- A fever in a baby under three months of age.
What You Can Do While Waiting for Your Doctor
- Rest and drink plenty of fluids, such as water, oral rehydration solution, soups and tender coconut water, unless your doctor has restricted fluids.
- Ask your doctor which fever medicine is safe. In suspected dengue, doctors often advise against aspirin and ibuprofen-type painkillers, so do not take them unless told to.
- Do not start antibiotics on your own. They do not work for viral infections and can make diagnosis harder.
- Use a mosquito net or repellent, even during the day, to protect others at home.
- Keep track of the temperature, the day fever began and any new symptoms to share with the doctor.
How to Prevent Mosquito and Waterborne Fevers at Home
- Empty and scrub water containers, coolers, flower pot trays and discarded items at least once a week.
- Cover water tanks and store drinking water safely.
- Clear coconut shells, old tyres and clogged gutters where rainwater collects.
- Use nets, screens and repellents, and wear full sleeves during peak mosquito hours.
- Drink boiled or purified water and eat freshly cooked, hygienic food.
- Avoid wading through floodwater, and wash well afterwards.
Getting Tested When You Are Too Unwell to Travel
When you have a high fever, travelling to a lab can be exhausting. White Glove Diagnostics in Kadri, Mangalore, offers blood tests and home sample collection for selected tests, with most reports delivered within about 24 hours and available online, which can help your doctor start the right treatment sooner. Confirm availability for specific fever tests when you book.
FAQs
If fever lasts more than two to three days, see a doctor. Seek help sooner for infants, older adults, pregnant women and people with other health conditions, or if any warning sign appears.
Common tests include a complete blood count, dengue and malaria tests, typhoid tests, liver and kidney function tests and urine tests. Your doctor chooses based on your symptoms and how long you have had fever.
Platelets can fall during dengue, so doctors monitor them along with other values and how the patient feels. Follow your doctor’s advice about how often to repeat tests.
Ask your doctor which medicine is safe. In suspected dengue, aspirin and ibuprofen-type painkillers are often avoided. Do not self-medicate with antibiotics.
White Glove Diagnostics offers home sample collection for selected tests. Confirm availability for your tests at the time of booking.
Remove stagnant water from containers, tyres, coconut shells and gutters, cover water tanks, use nets and repellents and keep your surroundings clean.
Final Word
Do not ignore a fever that refuses to settle. Early testing and proper medical advice make a real difference. If you or a family member has had a fever for more than two or three days, call White Glove Diagnostics on 91187 87911 or 824 796 2824, or consult the medicine specialists at the clinic. This article is general information and is not a substitute for medical advice.
