Health
Why Do Some Infectious Diseases Return After Years of Decline?
A quiet period can hide gaps in immunity. Travel, evolution and surveillance shape what happens next.
Health
Evidence-led explanations of bodies, minds and wellbeing.
Health
What Actually Happens to Our Muscles as We Age?
The surprising difference between losing muscle, losing strength and losing independence.
Health
How a placebo can change the feeling of pain
Expectations and learned associations can influence the brain’s pain systems, though the effect is variable and no substitute for treating a cause.
Health
Why a healing bruise changes colour
The body breaks down leaked blood, but a bruise's colours are far too variable to serve as a clock.
Health
Why waking up can leave you feeling lost
The science of sleep inertia and the slow return of alertness
Health
Why ears pop during a flight
How the eustachian tube balances pressure as an aircraft climbs and descends
Health
Are We Really Living in an Age of Anxiety?
Modern worries are real, but counting them is more complicated than the headline suggests
Health
Why Is Hay Fever More Than a Seasonal Sniffle?
The invisible cost of itchy eyes, broken sleep and an over-alert immune system
Health
What Is Actually Changing in Cancer Treatment?
Precision tests, immune therapies and smarter drug delivery are advancing care, with benefits that remain highly specific
Health
Why you sometimes wake just before your alarm
A regular sleep schedule and expectation can prepare the body to wake before the sound arrives.
Health
Why dehydration can give you a headache
A water deficit can trigger head pain through several pathways, but the exact mechanism is still debated.
Health
Why do muscles ache a day or two after unfamiliar exercise?
The ache that arrives after a new workout is called delayed-onset muscle soreness. It is linked to the stress of unfamiliar movement and the tissue response that follows, not to lactic acid left behind.
Health
Why does a fever make you feel cold?
When a fever begins, the brain can temporarily set a higher target temperature. Your body then acts as if it is too cold, even while the thermometer is climbing.
Health
Why Our Joints Crack and Pop
Some pops come from rapidly forming gas cavities; other clicks involve tendons and moving tissues.
Health
Why Do Humans Get Hiccups?
A brief breathing reflex makes a familiar sound, but its deeper purpose remains uncertain.
Health
Why Does a Scar Look and Feel Different from Skin?
Healing closes a wound, but it does not always rebuild the original fabric.
Health
Why Does a Bad Night’s Sleep Make Emotions Harder to Handle?
Sleep loss changes how we react and how much mental room we have to respond.
Health
Why Some People Faint at the Sight of Blood
A blood or injury trigger can set off a reflex that lowers blood pressure and briefly reduces blood flow to the brain.
Health
Why does a blocked nose change the taste of food?
When your nose is congested, your tongue can still detect basic tastes. What often disappears is much of the food's aroma, which normally travels from your mouth to your nose.
Health
Why Motion Sickness Happens
When the brain’s signals about movement disagree with its expectations, an ordinary journey can become nauseating.
Health
Why illness can feel worse at night
An ordinary cold may seem to take over the room after bedtime. The body's daily rhythms, the change in posture and the struggle to sleep can all contribute — but not every symptom peaks at night.