Why do we scream when we are in pain?

Screaming evolved primarily as an alarm signal to alert others and summon help, a reflex older than language. Modern research suggests it also has a side effect of raising the screamer's own pain tolerance.

Does saying ow actually reduce pain?

A 2015 study found that people who said ow while holding their hands in painfully cold water endured it longer than those who stayed silent. The physical act of vocalizing, not just hearing the sound, appeared to dull the pain.

Why does swearing help with pain?

Research by Richard Stephens found that swearing during a cold water test raised pain tolerance and lowered perceived pain. Cursing appears to trigger a fight-or-flight stress response that activates the body's ancient pain-suppression system.

Why does a heart attack cause pain in the left arm instead of the chest?

Nerve signals from the heart and the left arm converge onto the same spinal neurons. The brain, which has far more experience interpreting pain from the skin than from organs, guesses the signal came from the arm and projects the alarm there.

What is referred pain?

Referred pain is pain felt at a location distant from its actual source. It happens because sensory nerves from internal organs and from the skin share spinal pathways, so the brain misattributes an organ's signal to a more familiar surface location.

Why does brain freeze hurt your forehead when the cold hits your mouth?

Cold on the roof of the mouth triggers branches of the trigeminal nerve and a rapid change in cerebral blood flow. Because that same nerve normally reports from the forehead, the brain projects the pain there rather than to the palate.

Why does extreme cold feel like burning?

Because the body has no precise thermometer, only alarms that fire when temperature could cause damage. Extreme cold activates many of the same pain-carrying nerve channels as extreme heat, so the brain interprets both as a burning warning to withdraw immediately.

What is the thermal grill illusion?

It is an effect first demonstrated by Torsten Thunberg in 1896. When harmless warm and cool bars are interlaced and touched together, people feel intense burning pain, even though nothing is hot enough to injure them. Cold normally suppresses heat-pain, and the grill disrupts that suppression.

Why do chili peppers and menthol feel hot and cold without changing temperature?

Capsaicin in chili peppers activates TRPV1, the same nerve channel that detects painful heat, so peppers feel like burning. Menthol activates TRPM8, the cold receptor, so mint feels cool. Both chemicals hijack the body's real temperature sensors without altering actual temperature.

Why do paper cuts hurt more than deeper cuts?

Paper cuts are shallow and land right in the upper skin layers where pain nerves crowd most densely, so they irritate many nociceptors without passing beyond them. They also barely bleed, so no protective scab forms and the exposed nerves stay raw and reactive.

Why don't paper cuts bleed much?

Paper cuts are extremely shallow and narrow, so they open the tissue without reaching deeper blood vessels. Little blood means little clotting, which is why no scab forms to seal and quiet the exposed nerve endings.

Why are fingertips so sensitive to pain?

Fingertips contain some of the highest densities of touch and pain receptors in the body, and the brain devotes a disproportionately large area of the sensory cortex to processing signals from them. This makes the fingertip brilliant at detecting detail and unusually loud when injured.

What is the condition that makes people unable to feel pain?

It is called congenital insensitivity to pain with anhidrosis, or CIPA. It is a rare genetic disorder, affecting roughly one in a million people, in which pain signals cannot travel from the nerves to the brain. Affected people often also cannot sweat.

Why can't some people feel pain from birth?

In most cases a mutation in the SCN9A gene disables a sodium channel called Nav1.7, which normally lets pain signals travel along nerves to the brain. Without it, injuries are detected at the site but the warning never reaches the brain.

Is feeling no pain dangerous?

Yes. People who feel no pain cannot detect burns, fractures, infections or wounds, so injuries accumulate unnoticed. Many require constant supervision, suffer repeated damage to joints and eyes, and do not survive past early adulthood.

Why are cluster headaches called the suicide disease?

Cluster headaches earn the name because their pain is so extreme that sufferers describe wanting to escape it at any cost. Surveys rate the attacks among the most intensely painful human conditions, often above childbirth and kidney stones, and the desperation they produce is severe.

What does a cluster headache feel like?

Sufferers describe it as a red-hot ice pick or knitting needle driven behind one eye. The pain is one-sided, peaks within minutes, and lasts from fifteen minutes to three hours, often accompanied by a watering eye, a running nostril, and a drooping eyelid.

How are cluster headaches treated?

Ordinary painkillers work too slowly. The fastest treatments are breathing high-flow, one-hundred-percent oxygen through a mask and injectable or inhaled triptan drugs, both of which can stop an attack within minutes. Preventive medication reduces attack frequency during a bout.

Why do amputees feel pain in a limb that is gone?

Phantom limb pain comes from the brain, not the missing limb. The brain holds an internal map of the body that does not switch off after amputation. When confirming signals from the lost limb stop arriving, the map persists and can produce vivid, sometimes painful sensations.

How does mirror therapy treat phantom limb pain?

A mirror is positioned so the reflection of the intact limb appears where the missing one should be. When the patient moves both at once, the brain receives visual evidence that the phantom limb is moving, which can relax a clenched, painful phantom and ease the pain.

What percentage of amputees experience phantom limb sensations?

Studies estimate that roughly 60 to 80 percent of amputees continue to feel the missing limb. For a large share of them the sensation is painful rather than neutral, ranging from itching and cramping to severe burning or crushing pain.

What actually causes brain freeze?

Brain freeze is caused by blood vessels in the roof of your mouth, not by anything freezing in the brain. Cold makes them constrict, then rapidly swell back open, which surges blood into a cerebral artery and triggers a sharp pain signal.

Why does brain freeze hurt your forehead and not your mouth?

The pain is referred pain. The palate and the forehead share the trigeminal nerve, so when alarm signals arrive from the mouth, the brain misreads the source and projects the sensation onto the forehead instead.

How do you get rid of brain freeze quickly?

Press your warm tongue flat against the roof of your mouth to transfer heat and calm the overreacting blood vessels. Eating cold food more slowly prevents it, since the chill never reaches the sensitive back of the palate fast enough.

— UNTOLD · Filed under

pain

All essays in .

All essays filed in this edition, newest first.

UNTOLD · Body · NO. B01

The Ancient Alarm Hidden in a Cry of Pain

The sound that escapes when you stub your toe is older than language, and it may quietly help you endure.

By A. Renard — 05 Aug 2026

UNTOLD · Body · NO. B01

The Body's Lie About Where It Hurts

A heart attack often screams in the arm. The reason reveals how the brain builds pain from guesswork.

By A. Renard — 03 Aug 2026

UNTOLD · Body · NO. B01

The Language of Fire and Ice

Your nervous system was never built to measure temperature. It was built to sound one alarm.

By A. Renard — 02 Aug 2026

UNTOLD · Body · NO. B01

The Fingertip's Betrayal

A wound too small to bleed properly still hijacks one of the most sensitive instruments the body owns.

By A. Renard — 14 Jul 2026

UNTOLD · Body · NO. B01

The Children Who Cannot Feel a Burn

A rare genetic condition erases all pain, and in doing so reveals why the rest of us need it.

By A. Renard — 07 Jul 2026

UNTOLD · Body · NO. B01

The Clock That Brings the Fire

Cluster headaches arrive on schedule, leave no mark, and rank among the worst pains medicine can measure.

By A. Renard — 06 Jul 2026

UNTOLD · Mind · NO. M01

The Ghost in the Cortex

Amputees ache for limbs that no longer exist, and the answer rewrites what feeling itself means.

By J. Miro — 21 Jun 2026

UNTOLD · Body · NO. B01

The Headache You Can Switch On and Off

Brain freeze is a case of mistaken identity playing out in the wiring behind your face.

By A. Renard — 15 Jun 2026