The world that we live in is filled with sounds, some are comforting and some could be jarring too. But what if the constant noise surrounding us is doing us more harm than we realize? There has been immense research that shows that noise is not just a nuisance, but a silent killer and affects our health in ways we do not even know. There are associations of sound causing heart attacks, type 2 diabetes, and dementia.

How Does Your Body Respond To Noise?

Noise is seen as an annoyance, but it effects can go beyond what we imagine. When we hear a sound, it travels through the ear to the brain. This is where it gets processed by the amygdala. It is a region that is responsible for emotional responses. This also triggers a stress response- our heart rate increases, our blood pressure rises, and stress hormones like cortisol flood our system.

This response is also designed to help us react to immediate threats. Especially, if we hear the sound of a predator approaching. However, when we are exposed to constant noise, this response is triggered repeatedly and could compel us to live in a long-term anxious state.

Hidden Health Risks

Many studies including Harvard Health and theAmerican College of Cardiology have found associations of noise with health problems including putting a person at a higher risk of cardiovascular diseases such as heart strokes, attacks, and high blood pressure. The constant activation of the stress response can take a toll on the body, increasing inflammation and making it harder for the heart and circulatory system to function properly. Over time, this can lead to serious health conditions like heart disease and diabetes.

Even more troubling, research suggests that noise pollution may contribute to mental health issues. Studies have found a strong connection between exposure to noise and disturbed sleep, which in turn can cause anxiety, depression, and cognitive decline. The World Health Organization estimates that noise contributes to around 12,000 premature deaths annually across Europe alone. This invisible threat, however, is often overlooked because the effects are gradual and cumulative.

Noise and Sleep: A Silent Disturbance

One of the most insidious aspects of noise pollution is its impact on sleep. Even when we are asleep, our bodies are not fully immune to the effects of sound. Our ears never fully “turn off,” meaning that even faint noises can disrupt our sleep cycle. Research has shown that people who live in noisy environments—whether near busy roads, airports, or urban centers—often experience fragmented sleep, leading to fatigue and a weakened immune system. Over time, this chronic lack of restful sleep can lead to significant health problems, including an increased risk of developing cognitive disorders such as dementia.

The Urbanization Problem

As cities continue to grow, noise pollution is becoming more widespread. Traffic noise, in particular, is one of the most common and harmful sources. The rise of urbanization means more cars, buses, and trains, all of which contribute to an ever-increasing din. This urban soundscape is often relentless, with little respite for those living within it. In densely populated cities, people are exposed to high decibel levels, which can exceed safe thresholds for heart health. In many cases, the sheer volume of sound is not just unpleasant; it’s dangerous.

What Can We Do About It?

The solution is not as simple as reducing noise in our immediate surroundings, though efforts to reduce traffic noise and limit industrial sounds are essential. Some cities have taken steps to create quieter spaces by converting busy roads into pedestrian zones or installing noise barriers. These measures have shown to have a positive impact on public health, with research suggesting that even small reductions in noise can prevent premature deaths and improve overall well-being.

Even as climate change is driving mosquitoes north, a new study warned that Europe and North America can be new hotspots for the chikungunya virus.

Alarmingly, the research indicated that 139 countries face risk, covering 21.26 per cent of global land area for chikungunya, a mosquito-borne viral disease.

Further, the findings published in the journal Frontiers in Cellular and Infection Microbiology suggest that climate-driven vector expansion has significantly broadened the geographic scope of the CHIKV threat.

“We show that under climate change models, the virus will further expand northward into temperate regions, especially northeastern North America, central Europe, and East Asia,” said Dr Ye Xu, from Zhejiang Chinese Medical University, China.

Chikungunya is a viral illness transmitted to humans primarily through the bite of infected Aedes aegypti and Aedes albopictus mosquitoes.

How Climate Is Linked To Mosquito Behavior?

Also Read: Climate Change Fueled Rising Salmonella Drug Resistance Over Decades: The Lancet Study

As the primary vectors of chikungunya, Aedes aegypti and Aedes albopictus are highly influenced by climate conditions.

These mosquitoes thrive in warm and humid environments, with temperature playing a major role in their breeding, survival, and ability to spread the virus.

The rising temperatures can accelerate larval development, increase mosquito reproduction, and shorten the virus’s incubation period inside the mosquito, making transmission more efficient.

In the study, the researchers explained that stable temperature patterns and seasonal variations are especially important for Aedes aegypti. The species is highly sensitive to colder temperatures, with egg hatching rates dropping significantly at around 12°C. This limits how far the mosquito can spread into cooler regions.

However, climate change and warming temperatures are making previously unsuitable regions in Europe and North America more favorable for these mosquito species, raising concerns about the growing risk of chikungunya outbreaks, the team said.

“Because this mosquito can tolerate cooler conditions better than the yellow fever mosquito, warming may allow it to establish in places that used to be too cold,” said Dr Yang Wu, Guangzhou Customs Technology Center, China.

“When suitable mosquitoes become established, the chance of local chikungunya transmission increases.”

Global Chikungunya Cases

Read More: 16 Million Indians Die Due To Hypertension Every Year: AIIMS Doc

In 2025, there were 502,264 reported chikungunya cases globally, accounting for 186 deaths across 41 countries and territories, according to the Pan American Health Organization.

This disease burden is projected to escalate under climate change, which is profoundly altering the distribution patterns of infectious diseases, the researchers noted.

“The public does not need to panic, but health systems should prepare early,” warned Dr Xu.

The researchers recommended that these regions implement proactive entomological surveillance and adaptive public health infrastructure by 2040 to mitigate the threat of emerging arboviral epidemics.

Among the proposed measures, researchers include

• tracking mosquitoes,
• training healthcare workers to quickly recognise the virus,
• strengthening mosquito control,
• setting up rapid-response plans before outbreaks occur.

Chikungunya Symptoms You Should Know

Most symptoms are generally self-limiting and last for 2–3 days. The disease is characterized by

• an abrupt onset of fever,
• joint pain
• muscle pain,
• headache,
• nausea,
• fatigue
• rash.

In recent times, there has been a noticeable increase in heart-related risks among Indians in their 20s. In the past, heart disease was mainly a problem of old age, but the changing lifestyles, poor eating habits, and rising stress levels have changed this trend. This has increased the number of doctors recommending a calcium heart scan also called a coronary calcium scan, even for young adults.

What Is A Calcium Heart Scan?

A calcium heart scan is a quick painless imaging test that checks for calcium deposits in the coronary arteries. These deposits are one of the earliest signs of atherosclerosis, a condition in which plaque builds up inside the arteries and restricts the flow of blood.

The significance of this test is that it can uncover hidden risk even before symptoms such as chest pain and breathlessness appear.

Why Young Indians Are At Higher Risk

Young Indians face multiple risk factors today. Sedentary lifestyles long working hours also lack of physical activity, smoking and increased intake of processed foods are major contributors. Ailments like diabetes, obesity, high cholesterol and hypertension are also being seen at a much younger age.

Family history also matters a lot especially in the Indian population who are genetically more prone to early heart disease.

The worry is that many young people seem healthy on routine tests but may still have silent plaque build-up. This is where a calcium score is useful. The higher the score, the more likely you are to have future heart problems, and doctors can take early steps to prevent them such as lifestyle changes or medication.

Why Early Screening Matters

Another important point is that heart attacks in young Indians are often more sudden and severe. This makes early screening all the more important. Calcium heart scans don’t replace your routine check-up, but they do provide an extra level of insight in helping to identify hidden cardiovascular risk.

This scan is not about instilling fear but about early awareness and prevention. Heart disease if found early can often be controlled or prevented. This small step can help to protect young adults with risk factors for long term heart health.

(By Dr. Surendra Nath Khanna, Chairperson, Adult Cardiac Surgery & Heart - Lung Transplant at Artemis Hospital, Gurugram).

Climate change caused a 10 per cent global increase in Salmonella antibiotic resistance genes between 1940 and 2023, according to the first-of-its-kind study published in The Lancet Planetary Health journal today.

Antimicrobial resistance (AMR) is mainly driven by the overuse and misuse of antibiotics, which allows resistant bacteria to survive and spread.

However, rising temperatures and changing rainfall patterns can influence how bacteria survive, mutate, and spread, potentially increasing the exchange of antibiotic resistance genes.

“The accumulated evidence suggests that climate change is an accelerating force behind the global spread of antimicrobial resistance,” the study authors wrote in the paper.

What Are The Findings?

The study provides supporting evidence that AMR doesn’t just increase steadily as temperatures rise, but that the number of resistance genes changes over time in a more complicated way, depending on both temperature and rainfall. This suggests that environmental changes can speed up how bacteria adapt to antibiotics.

“These findings reinforce the idea that climate change alters microbial ecological stability and accelerates resistance evolution across human, animal, and environmental reservoirs," said the global researchers.

How Was The Study Conducted?

The current study analyzed the genomes of more than 480,000 Salmonella samples from 139 countries, collected between 1940 and 2023, and compared levels of antibiotic resistance genes with changes in average temperature and rainfall over time.

Of the total, 82 per cent of countries saw increases in antibiotic resistance genes in Salmonella, with the strongest climate-associated increases occurring in the Middle East and North Africa, followed by South Asia and Sub-Saharan Africa.

While the study shows a link between climate change and antibiotic resistance genes in Salmonella, it does not prove that climate change directly causes the increase.

The study also used a model to predict the change in antibiotic resistance genes in Salmonella by 2100 under different climate emissions scenarios.

The model suggests that if countries meet low-emission climate targets and strengthen efforts to use antibiotics responsibly, levels of resistance genes could be 24% lower than under the highest-emission scenario. However, they caution that these projections, as with all models, involve uncertainty.

The researchers stressed the need to consider climate change when monitoring and addressing AMR. They add that stronger climate action, alongside responsible antibiotic use and improved disease surveillance across humans, animals, and the environment, will be important in limiting the future spread of AMR.

What Is Salmonella?

As per the US Food and Drug Administration (FDA), Salmonella is a group of bacteria that can cause gastrointestinal illness and fever called salmonellosis. It can be spread by food handlers who do not wash their hands and/or the surfaces and tools they use between food preparation steps. It can also happen when people consume uncooked and raw food. Salmonella can also spread from animals to people.

Common symptoms of Salmonella include

• diarrhea,
• fever,
• stomach cramps 6 hours to 6 days after being exposed to the bacteria.

Children younger than 5, adults 65 and older, and people with weakened immune systems are more likely to have severe illness.