As September continues, seasonal illnesses remain a concern across India. Monsoon and post-monsoon conditions can create favourable conditions for mosquito-borne diseases such as dengue and malaria, while respiratory infections such as influenza can also increase around this time. The Union Health Ministry has also highlighted dengue, malaria, diarrhoeal diseases and leptospirosis among the illnesses requiring attention during the monsoon season.

Recent health reports from Rajasthan have also pointed to increased seasonal influenza activity, with officials urging continued surveillance and preparedness during the post-monsoon period.

That makes it important not to dismiss a persistent fever, unusual weakness or breathing problems as simply a “seasonal fever.” Here are five symptoms worth taking seriously.

1. A Sudden High Fever

A sudden high fever can occur with several infections, including dengue, influenza and other viral illnesses. Dengue commonly begins with an abrupt fever and may be accompanied by severe headache, pain behind the eyes, muscle and joint pain, nausea or a rash.

Because different infections can look similar during the first few days, guessing the cause based only on symptoms can be risky. If a fever is high, persistent or accompanied by other concerning symptoms, medical advice is more appropriate than simply taking medicines on your own.

2. Severe Body Pain or Headache

Strong muscle and joint pain, intense headache or pain behind the eyes can occur with dengue. These symptoms are particularly important when they appear alongside fever.

WHO notes that dengue transmission often increases during and after rainy seasons because mosquito populations can grow under favourable conditions.

A person with fever and significant body pain should therefore avoid assuming that it is automatically a routine viral infection.

3. Repeated Vomiting or Unusual Weakness

Repeated vomiting can contribute to dehydration and may also be a warning sign in someone with dengue.

The Indian government’s National Centre for Vector Borne Diseases Control lists frequent vomiting, bleeding, extreme thirst or dry mouth, sleepiness or restlessness, a rapid weak pulse and difficulty breathing among symptoms associated with severe dengue.

These symptoms warrant prompt medical attention rather than waiting for the illness to resolve on its own.

4. Cough, Sore Throat or Breathing Difficulty

Not every monsoon fever is caused by mosquitoes. Influenza and other respiratory infections can also circulate during the monsoon and post-monsoon period.

Rajasthan health officials recently advised people to watch for symptoms such as fever, cough, sore throat and breathing difficulty as seasonal influenza activity increases.

Breathing difficulty is particularly important because it can indicate a more serious illness and should not be ignored.

5. Fever That Keeps Returning or Doesn’t Improve

One of the biggest mistakes during seasonal illness is assuming that every fever will disappear after a day or two.

Dengue, malaria, typhoid and influenza can have overlapping symptoms, which is why diagnosis matters. Recent medical guidance has stressed that testing may be needed to distinguish between these infections rather than relying only on symptoms.

If fever persists, returns after improving, or is accompanied by worsening weakness, vomiting, bleeding, confusion or breathing problems, consult a healthcare professional promptly.

The Bottom Line

September can still bring significant seasonal health risks in India. Mosquito exposure, contaminated water, changing weather and respiratory infections can all contribute to illness during the monsoon and post-monsoon transition.

The safest approach is simple: don’t self-diagnose a persistent fever. Stay hydrated, protect yourself from mosquito bites, maintain hand and food hygiene, and seek medical advice when symptoms are severe or unusual.

This article is for general awareness and is not a substitute for professional medical advice or diagnosis.