Seasonal Fever: When to Seek Medical Attention

Why fever season is different in Chennai

Fever cases here follow a fairly predictable annual pattern. The north-east monsoon between October and December leaves standing water across the city, and mosquito-borne illness — dengue in particular, and chikungunya — rises sharply in the weeks that follow. The change of season around June and again in November brings the usual wave of viral respiratory infections.

This matters for one practical reason. In a setting where dengue, typhoid and malaria all circulate, a fever that goes past three days deserves a look rather than another day of paracetamol. In many parts of the world that would be over-cautious advice; here it is not.

What most fevers turn out to be

The large majority of fevers we see are ordinary viral infections that resolve on their own in three to five days. They typically come with a sore throat, runny nose, cough, body ache and tiredness, and they do not need antibiotics — antibiotics have no effect on viruses and carry side effects of their own.

The remainder are bacterial infections such as throat, urinary or chest infections that do need treatment, and the mosquito-borne and water-borne illnesses common in this city. Distinguishing between them is what a consultation is for, and it usually rests on the pattern of symptoms rather than on a large panel of tests.

Warning signs: be seen the same day

Any of the following means a fever should not be managed at home.

• •Breathing difficulty: Breathlessness at rest, rapid shallow breathing, chest pain, or blue-tinged lips.
• •Persistent vomiting or inability to keep fluids down: Dehydration develops quickly with a fever, particularly in children and older adults.
• •Severe headache with a stiff neck: Especially with sensitivity to light — this needs urgent assessment.
• •Confusion, drowsiness or difficulty waking: Any altered alertness during a fever is a red flag.
• •Bleeding: Bleeding gums, nosebleeds, blood in vomit or stool, or unusual bruising.
• •A rash that does not fade when pressed: Press a clear glass against it; a rash that stays visible needs emergency assessment.
• •Reduced urine output: Passing much less urine than usual, or none for eight hours or more.
• •Fever above 103°F that does not respond to paracetamol: Particularly if it climbs again quickly after each dose.
• •Any fever in an infant under three months: This always warrants immediate medical assessment, regardless of how well the baby otherwise appears.

Dengue: what to watch for and when to test

Dengue typically begins with a sudden high fever, severe headache, pain behind the eyes, marked muscle and joint pain, and sometimes a rash. Most cases recover with fluids and rest.

The critical period is not at the peak of the fever, which surprises many patients. It is the 24 to 48 hours as the temperature comes down, usually days four to six. Warning signs appearing in that window — severe abdominal pain, persistent vomiting, bleeding, restlessness or lethargy — need immediate attention even though the fever itself appears to be improving.

Timing also determines which test is worth doing. The NS1 antigen test is most reliable in the first five days of illness, while IgM antibodies take roughly five to seven days to become detectable. A test performed on the wrong day can return a negative result in someone who genuinely has dengue, which is precisely the false reassurance we want to avoid.

One further point: avoid ibuprofen, aspirin and similar anti-inflammatory painkillers if dengue is a possibility, because they increase bleeding risk. Paracetamol is the appropriate choice until the diagnosis is clear.

Home care that genuinely helps

• •Fluids, steadily: Water, buttermilk, coconut water, rice kanji water, ORS. Small amounts frequently are easier to keep down than large amounts occasionally.
• •Paracetamol at the correct dose and interval: Follow the dosing on the pack and do not shorten the gap between doses. Check that you are not taking a second combination product that also contains paracetamol.
• •Rest: Continuing to work through a viral fever prolongs it and spreads it to colleagues and family.
• •Monitor rather than watch: Note the temperature, how much fluid is going in, and how much urine is passing. These are the numbers we will ask for.
• •Skip the leftover antibiotics: Taking antibiotics kept from a previous illness is common and actively harmful: it does not treat a virus, and it can mask the picture and delay the correct diagnosis.

Fever in children and older adults

In children, how the child looks and behaves is more informative than the number on the thermometer. A child with a temperature of 102°F who is drinking, alert and playing between episodes is generally less concerning than a child at 100.5°F who is unusually drowsy, refusing fluids, or difficult to rouse. Any fever in a baby under three months needs medical assessment straight away.

In older adults the reverse problem arises: a serious infection may produce only a modest temperature, or none at all. New confusion, unsteadiness, a fall, or simply not being themselves can be the presenting sign of pneumonia or a urinary infection in someone over seventy. Do not wait for a high reading before seeking advice.

How long is too long

As a working rule: a fever with mild symptoms that is settling by day three needs nothing more than rest and fluids. A fever still present on day four, a fever that settles and then returns, or a fever accompanied by any of the warning signs above should be assessed.

At Srinivasa Health Clinic we can arrange the relevant blood tests the same morning and review the results the same evening, which for most patients means a clear answer within a day rather than across several appointments.