We often take for granted the way our bodies keep us informed. A tickle in the throat tells us a cold may be coming. A sudden pang of hunger prompts us to eat. The sharp sting of a cut makes us reach for a bandage. These moments are powered not only by our five primary senses- sight, hearing, touch, taste, and smell- but also by a lesser-known sixth: interoception. Interoception is our ability to detect internal signals from the body, such as heartbeat, breathing, hunger, thirst, temperature, or the need to use the bathroom. For most people, this sensory network works in harmony. But for others, including people with Down Syndrome, autism spectrum disorder, or other sensory processing differences, the signals may be faint, delayed, or interpreted in unexpected ways. Globally, Down Syndrome occurs in approximately 1 in every 1,000 live births, according to the World Health Organization (WHO). In India, estimates suggest around 30,000 babies are born each year with the condition. Many of these individuals experience some form of sensory difference, with downstream effects on daily functioning and health outcomes. Despite this, a 2022 report in The Lancet Public Health noted that sensory processing differences remain under-assessed in routine healthcare, leading to preventable complications. This shapes how they perceive discomfort, identify health concerns, and act on medical advice.
Interoception, often described as the “sense of the internal body,” is what lets you recognise that your heart is racing after climbing stairs, that you need to drink water on a hot day, or that you’re full after a meal. In people with Down Syndrome, research has shown that communication between the brain and body can work differently, affecting both cognitive processing and sensory awareness. A 2020 study in the American Journal on Intellectual and Developmental Disabilities found that individuals with Down Syndrome were less likely to report pain spontaneously, even when clinical examination revealed clear signs of discomfort. When interoceptive awareness is limited, the body’s early warning system can fail to alert a person- leading to real-world consequences. In one case study documented by the Journal of Intellectual Disability Research (2018), a 32-year-old man with Down Syndrome was admitted to hospital with severe dehydration after spending a summer afternoon outdoors. He had not expressed thirst and continued engaging in activities until he collapsed. Similarly, Australian disability health records show that heat-related illnesses are disproportionately higher in adults with intellectual disabilities, often linked to reduced thirst awareness and difficulty interpreting environmental cues. Someone may not feel thirsty until they are already dehydrated, notice pain from an ear infection only when it becomes severe, or overlook subtle symptoms such as fatigue or low appetite, making early intervention harder.
Each of our primary senses also plays a role in recognising health cues. Vision allows us to spot a rash or swelling. Hearing helps us detect a wheeze or persistent cough. Touch alerts us to a fever or a cut. Smell can warn of spoiled food or smoke, while taste can indicate contamination. In Down Syndrome, sensory differences are well documented: up to 60–80 percent experience some form of hearing loss, often due to chronic ear infections or structural ear differences, and between 50–80 percent have vision problems such as refractive errors, strabismus, or cataracts. Sensitivity to touch can also vary- some may be hypersensitive and find certain textures uncomfortable, while others are hyposensitive and may not notice minor cuts or temperature changes. In practical terms, a child with Down Syndrome and moderate hearing loss may not react to a fire alarm unless it is paired with a visual strobe light, and an adult who doesn’t register thirst early may need scheduled hydration breaks, especially in hot climates.
This is why the common public health message to “listen to your body” is not universal advice. Such guidance assumes that everyone receives, interprets, and acts on bodily signals in the same way, but for those with reduced interoceptive awareness or altered sensory processing, relying solely on internal cues can be risky. A missed pain signal could lead to ignoring a broken bone, and an unrecognised fever could allow an infection to spread. A 2019 study in the Disability and Health Journal found that adults with intellectual disabilities were significantly more likely to present with late-stage illness compared to the general population, partly because symptoms were not noticed or reported early.
Bridging this gap in health literacy requires moving beyond words and adopting multi-sensory communication strategies. Visual aids showing what symptoms look like, tactile cues such as textured thermometers or wearable devices that vibrate when it is time for medication, and scheduled health checks instead of symptom-based care can make a difference. The Easy Health programme in the UK has developed picture-based leaflets showing step-by-step how to check for common symptoms, such as skin infections or tooth decay. In Japan, wearable hydration sensors that alert users via vibration are being piloted for elderly and disabled populations prone to dehydration. A similar innovation in India, tested in Ahmedabad, used pictorial medication calendars for people with limited literacy, resulting in a 27 percent improvement in medication adherence over three months. Environmental adaptations, like pairing auditory alarms with flashing lights or providing smell checks for people with reduced olfactory senses, also help. Healthcare providers need training to recognise when a patient may not fully perceive or communicate symptoms. In the UK, for example, the “Hospital Passport” programme records a patient’s sensory needs, communication preferences, and baseline health behaviours so that hospital staff can adapt care accordingly.
Our senses are the body’s first line of defence, but they are not the same for everyone. For people with Down Syndrome or sensory processing differences, “listening to the body” may require help from others, assistive technology, and supportive environments. True health literacy is not just about sharing information- it’s about ensuring that everyone, regardless of sensory ability, has the tools, systems, and support to understand what their body is saying and act on it in time.