Questions tagged [pain]

Tag for questions pertaining the sensation of unpleasant sensory and emotional experiences associated with actual or potential tissue damage.

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Is there any universally accepted definition for pain?

There are many terms in the literature of any domain of knowledge that does not have a standard or universally accepted definition. There can be several definitions from several organizations or ...
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Why do people get headaches after oversleeping?

I've tried a web search, but the results are mostly non-scientific advice on good sleep etc. One link provides some explanation, but I have not noticed them providing links to that referenced research:...
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2 answers
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Are sensory mechanoreceptors and mechanical nociceptors the same type of neurons or are they different?

I always supposed the neurons / receptors which transmitted touch and pain were the same, since they react to stimulus which are the same but with different intensity, and they just sent a stronger ...
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Do beavers' tails hurt from being dragged?

I understand that when beavers walk on land, they drag their tails behind them on the ground. Their tails look quite large and rather heavy, and the ground is often rough - does dragging the tail not ...
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How can tooth enamel feel pain when drilled by a dentist?

Enamel has no nerves, so theoretically a tooth should not feel any pain when a dentist bores into it. Yet still we use anesthetics... Maybe it’s dentin's fault? It apparently has some tubes filled ...
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15 votes
1 answer
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Inability of vultures to digest diclofenac

The population of Indian vultures has been rapidly declining since 2003. This is attributed to the diclofenac present in the carcasses which the vultures eat. Vultures seem to digest all sorts of food ...
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What kinds of fish tend to have a rapid death after being caught?

I am asking this question because I am trying to make my diet less cruelty-oriented, for this reason this question can be related to trolley problem since I am coping with an ethical problem trying to ...
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2 votes
1 answer
424 views

Laparoscopic surgery: Why did the gas cause pain in my shoulder, and how did it escape my body? [closed]

I recently had Laparoscopic surgery, and the nurse told me I would experience pain in my shoulder and burping as the gas escapes my system. I looked up a bit of information on the "pain in my shoulder"...
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3 votes
1 answer
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Surface perception

I'm looking for research studying: How small and compressed together do particles of a surface need to be to be perceived as solid surface to human touch? E.g. sand still feels grainy. Has there been ...
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Why does it take 24 hours for tendons to give feedback on whether the loads they received were excessive?

I heard in this interview of Jill Cook (tendon researcher) on https://youtu.be/GKkSp-TlofI?t=230: Tendons talk to you 24 hours later. So what happens if if I put load on a tendon today, it will ...
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2 votes
1 answer
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How do painkillers prevent shock?

I was reading about the Placebo effect and came across this little story: The roots of the placebo problem can be traced to a lie told by an Army nurse during World War II as Allied forces ...
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How do NSAID's work and what are the differnces between COX-1 and COX-2? [closed]

NSAID's work by slowing down the COX enzym, but how do does enzymes cause pain? because I've read that they're also needed for the body and do "good" things.
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Pain perception in animals with nerve nets

Are animals with nerve nets, like sea urchins and jelly fish, theoretically able to feel pain? They have output and input organs which would make them "vulnerable" to feel pain but on the ...
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Does a severed limb/finger experience pain after its separated?

If a person ends up with a severed finger will that finger, after falling off, experience any pain and start writhing? Can a limb kind of have a mind of its own for a few more seconds after separating ...
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7 votes
1 answer
312 views

Does spinal cord have pain receptors?

I understand that the brain itself does not have pain receptors, so when the brain is damaged or cut, there is no experience of pain. For example, surgeons can operate on the brain while a patient is ...
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What part of the body holds the most pain receptors?

What part of the body holds the most pain receptors or is likely to cause someone to feel the most intense pain? I thought it was the eyes but I can't find that source anymore.
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27 votes
3 answers
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Do oysters feel pain?

Do oysters feel pain when you bite into the inside, or when you crack open the shell? I tried google searching it to no avail. When you bite inside the oyster or when you break the shell to open the ...
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1 answer
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Results of self-administration study about pain in honeybees?

There research on nih.gov about ability of bees feel pain. But I can't understand their conclusion. Could you provide necessary excerpts here from those study so it would be clear what conclusion they'...
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Pain and Angina Pectoris

What causes pain in an angina pectoris? Ok, heart muscles may lack oxygen, but what is the role of pain here? Is it being beneficial? I'd like to know the physiological process of induction of pain ...
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1 vote
1 answer
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Is it the theory of the 5 senses obsolete? [closed]

An enigmatic topic in traditional science was labelled as the mystery of the 5 senses, and how to best group senses by type. Is that theory now meaningless? Do Scientists still agree that that ...
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5 votes
3 answers
7k views

Do lobsters possess a nervous system to feel pain?

I was reading an article, which it mentions that lobsters do not have a nervous system: Lobsters have very poor eyesight and no nervous system. They walk slowly on the sea floor but are capable ...
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2 answers
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At what stage is the nervous system developed enough to interpret neuronal signals as 'pain'?

According to this article in Live Science, one of the reasons the fetus can't feel pain until 19 weeks is because the nervous system isn't fully developed. But according to this article, the heart ...
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1 vote
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Where does the pain from headaches come from [duplicate]

I may be wrong but I have always thought that the brain doesnt have any nerve endings, so why is it we get headaches and where does this pain come from? I have heard lack of sleep, hydration or ...
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What makes a rotator cuff tear symptomatic in humans?

The majority of rotator cuff tears is asymptomatic {1}. What makes a rotator cuff tear symptomatic or asymptomatic in humans? References: {1} Minagawa, Hiroshi, Nobuyuki Yamamoto, Hidekazu Abe, ...
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3 votes
1 answer
269 views

Why is burn feeling 'slower' than touch?

When you touch a hot object you first feel the touch and only after a second you feel the burn too, and if you detach your skin from the object the burn feeling continues for few seconds. I remember i'...
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Why are interneurons needed in the spinal cord for polysynaptic reflexes and somatosensory tracts to the brain?

The single explanation I found for the polysynaptic reflex is that the interneuron diverges into more pathways, such as the efferent motor neuron, the inhibitory neuron to the opposite extensor muscle,...
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3 votes
1 answer
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Why pain caused by blunt objects vanish after some time and return at the event of touching?

Background When any bone/muscle of body is hit badly by a blunt object, it hurts pretty bad of course for some time. But, after some time the pain goes off completely or to some extent. Then, if we ...
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3 votes
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Why does crippling pain exist? [closed]

Some kinds of trauma can cause pain so severe that it makes you unable to move or do anything at all. It may put you out of action and unable to help yourself because of how excruciating it is. ...
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Is there an evolutionary advantage associated with migraine? [duplicate]

I have read Wikipedia article on Genetics of migraine headaches and I don't buy it Because genetics influence susceptibility to migraine, it can be shaped by evolution. Fitness-impairing ...
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14 votes
4 answers
5k views

Is it possible to feel pain in some part of a body, but the pain "feeling" is introduced somewhere else?

Is it possible to feel pain in some part of a body, but that the cause of the pain is situated elsewhere in the body? For example, somebody feels pain in his toe, but it turns out that this pain is ...
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18 votes
3 answers
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What is the cause that angina pectoris is felt in your left arm?

When someone has heart problems sometimes they feel pain in their left arm. But why is the left arm painful?
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How does lactic acidosis lead to pain?

I come from Physics, not biology. My understanding is that without sufficient oxygen present, the Krebs cycle terminates in lactic acid formation for the body to later continue the reaction when ...
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21 votes
1 answer
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Is it painful for the hen to lay eggs?

My little son just asked me this question. His mother used to complain about the excruciating pain she suffered when she gave birth to him. He is a compassionate kid and wonders whether the hen goes ...
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4 votes
2 answers
142 views

Reseach on feeling pain of other people

I'm more of a tech than bio kind of guy, but I have read and learned a lot alongside of my girlfriend's education. Which is very interesting!! Currently I want to investigate : people claiming to ...
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7 votes
1 answer
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What stimulates a nociceptor?

For instance, when pressure is applied to the skin, what determines how much pressure results in nociceptor stimulation. And when a sharp object pierces the skin, why is pain, rather than simply touch,...
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4 votes
1 answer
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What causes the pain when a bone fracture is healing?

Why does a fracture still hurts when it is healing? I understand the pain at the beginning - the bone is not in its place, there is a pressure against the nerves, also the swelling pushes the nerves ...
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2 votes
1 answer
114 views

Why does mud therapy work by some pain related diseases?

Apparently, some users here agree there is no ion exchange through the skin. Mud therapy has some therapeutic effect for pain related diseases. As an anecdotal example, I experienced pain relief by ...
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5 votes
1 answer
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How does Tylenol relieve pain without making me drowsy?

So I have a crown that popped out and has been killing me, I've lived on a steady diet of Tylenol since it popped out. I've noticed that aside from killing most of the pain from the tooth, the tylenol ...
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1 answer
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Most painless method for killing insects

I'm planning on having a small farm of crickets or grasshoppers. I would like to cause them as little suffering as possible, so I'm wondering what is the most painless way to kill them? So far, the ...
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1 answer
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Can someone die from pain? [duplicate]

I'm a CNA and I just got home from a very long day at work. I just started this job and I got hurt at work last night which made me wonder can enough pain cause death (without suicide)? I think the ...
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3 votes
1 answer
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How is pain induced by blunt and sharp objects?

Normally, when something touch you, you won't feel pain. With a great force "touching" you, you will feel pain. However, if something that is spiky makes contact with you, you will feel pain. So, how ...
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5 votes
1 answer
477 views

Why isn't the upper limit of pain lower in humans?

From what I understand, pain is an useful mechanism that signals us that something is not quite right with our body (in particular, we're under attack). It's good - it alert us and tells us that we ...
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Skin extra sensitive to heat after burn

I just got my finger burnt (first degree burn $\Rightarrow$ I didn't even bother to bear the wound). It didn't hurt much, even when I pressed the wound. However, when exposed to heat (hot water, but ...
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2 answers
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If one endures the same form pain over a long period of time, would the pain begin to lose intensity?

Metaphorically thinking, if one endured the pain of constant burning for decades, would the pain slowly lose its strength?
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-3 votes
1 answer
219 views

Normal death experience [closed]

Consider a natural cause of death (no car accidents etc) - Is it true that death is generally preceded by suffering? In other words, are we destined to experience the most severe suffering we could ...
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5 votes
1 answer
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Can nociceptors die because of too much mechanical stress?

In martial art people hit their body (e.g., with small bean bags) to become more insensitive to pain. Can the sensory neurons die during this procedure? I think this is just an urban legend. Instead, ...
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2 votes
1 answer
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What is the distance between the sciatic nerve and the colon at the closest point?

Is it possible that a full colon impinges on the sciatic nerve? Is there anything that physically separates the sciatic nerve from the colon?
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4 votes
2 answers
704 views

Does suffocation pain involve nociceptors?

I never suffocated myself so not entirely sure, but when you suffocate, it's painful, right? But of course different kind of pain than being injured or sick. What I'm wondering is, if the "painful" (...
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2 answers
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Does the body have a gate control for pain

I understand it is not the most accurate source but I recall a House episode where he claimed the body had a control mechanism for pain in which only the most painful thing was felt. Is that true? and ...
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7 votes
1 answer
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What's a mouth ulcer/canker sore "made of", and why do they develop?

Mouth ulcers are red/white rings with a crater. They are sore and last for 7-10 days. What I want to know is what they are 'made of' - i.e., what is the ring filled with, and why is the centre crater ...
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