Why do we shake when we get a quick cold chill?
815926
That is actually an interesting question.  Scientists have shown that shivering is actually a very effective means to move the body around, which in turn is a good way to generate some heat quickly.  Going for a run would do the same, but the brain sends a signal to shiver just to get your body heat up.  \n\nYou also may shiver when you are sick.  Fever is one of the body's defense mechanisms.  (It helps kill germs, although it is dangerous when it gets too high.)  So you run a fever, and one way to heat up is to send the word to shiver.\n\nGood luck!!
557557
Yeah, it's a side effect of the adrenaline and collagen that your body releases during stressful times.  Mother Nature didn't intend for us to be put in the kind of stressful social situations that we find ourselves in sometimes, but our body doesn't know the difference.  \n\nWhen you get stressed out, your body illicits the same response that it would if you were being attacked by a grizzly bear.  Your body uses adrenaline and collagen to prepare your body for the "fight or flight" response.  Basically, it is a way for your body to maximize the use of your muscles in the shortest possible time period.  \n\nWhen you don't use that energy, your body might start to use it automatically, resulting in uncontrolled shaking.
201300
When your sick and you are shivering, generally it means you are running a fever - take your temperature....\nNormally when you begin to sweat, it can mean that your fever is breaking (going away...take your temp to check it)...\nDon't freak out unless your temp gets to 102 or 103 and you can't get it to go down on its own ...drink lots of clear liquids and get plenty of rest...\nGet better soon....
812839
Basically your body becomes very warm, which causes vasodilation of  your blood vessels. Meaning your blood vessels "expand" thus there is less flow to your brain, hence your lightheadedness. If you sit in a really hot tub for 30min and then quickly stand up and jump around,  you might even pass out.
434805
A lot of this is in our mind.  We simply expect to feel chilly, therefore we do.  It is really simple to just put on a sweater, wear a sweatshirt, even wear a jacket so we will not feel chilly.  Then when we "warm up," take off whatever we had on.  The initial problem, though, is that when we take off the sweater, for example, we will feel chilled again after a short time UNLESS we are doing something physical.  Just sitting around gets to us and can make us feel chilly.\n\nThe best way to get over feeling chilly is to do something physical, walk around the house, go outside and walk around, take out the trash, do dishes, most anything.  Doing even the mildest physical activity will resolve any feeling of chills.
38660
when you go into hot water or anything hot the part that goes in first (usually your feet) gets real hot so the rest of your body feels much colder compared to your feet. when you get cold your veins and arteries expand so they can get more blood through causing your skin to get streched out which makes you hairs to stand up creating "goosebumps". i hope you can understand this.
1105001
I know you want to avoid icy cold drinks when its hot, because your body may reject them.  Especially if you are working out or dehydrated, its better to drink room temperature or only slightly cool water.  But hot drinks dont sound that good for you either.
813579
Our bodies remain at a temperature of 37deg celcius for optimum functioning and health. When we are cold our bodies are in danger of loosing that vital heat, so it has developed various methods to stop this from happening.\n\n1) we shiver. This generates heat, as the vibrations of our body cause friction. \n\n2) out body hair stands up on end (goose pimples) to trap air next to our body and form a layer of insulation around us, preventing heat from escaping.\n\nThese two functions are enough to replace any heat lost to the surroundings which have triggered these reactions.\n\nOur boby will remain at 37deg celcius whether we are standing in a steam room or ice box.
845808
Chattering and shivering is a way for the body to generate heat for the internal organs.
946297
Do you have anay other symptoms?  Being cold could be something that is totally no big deal, like a change in metabolic processes (ie, how you're digesting and stuff).  Fevers and flu often cause chills.  It could also be heart or kidney-related and somewhat serious.  Talk to your parents if you're seriously freaked out about it.  If the cold is the only symptom though, it's probably nothing to worry about.
441458
I heard my friend's mum describe it:\nYou suddenly get hot, then your skin becomes prickly (pins and needles?), sometimes breaking out in goose-bumps, then you sweat which makes your skin cool down and your body is fighting between being hot and cold... and so you feel horrible because of these body temperature changes. \n\nShe said it's due to a certain hormone that controls body temperature.
833861
Cold is nasty. But at least it means you can go skiing.\n\nDifferent degrees of cold feel different.\n\nTo about -5C it probably feels much like you have experienced. From -5C to about -15C the air is drier and it ironically can feel warmer than 0C (though windchill is nasty - the effect of windchill is to drop effective temperature very rapidly even for quite slow moving air).\n\nAt -15C the hairs in your nose freeze as you breath.\n\nAt about -25C your jeans go stiff as you walk.\n\nSnow behaves differently too as it gets colder. At around -20C it squeeks when you walk on it, and much below -10C it is pretty useless for making snow balls. By the way, it does not snow when its really cold - snow needs a temperature near 0C.\n\nAnd ice is odd too. If you skate, ice gets faster the colder it is. At -20C its like skating on glass.
970477
When cold air hits your face or other exposed skin it can feel as if it is biting or nipping at you.\nNipply on the other hand is something quite different. :)
78715
Brain freeze is the result of drinking a cold beverage.  The cold fluid in your throat is in close proximity to the ateries that supply your brain, and the blood ends up getting chilled, which causes a moment of pain in your head.
520724
Mandbturner is partially right. It is when you have a shiver, but the actual myth is that you shiver when someone or something walks over the place where you will be buried when you die. Another version is "A goose walked over my grave."  This is why those little bumps you get on your skin when cold are called "goosebumps" or "goosepimples".
585735
The reaction is triggered by the cold substance consumed coming into contact with the roof of the mouth. It irritates nerves in the region (sphenopalatine ganglia), causing them to spasm. These nerves cause the blood vessels in the brain to dilate. When vessels in the brain dilate, a common effect is an acute headache (a similar effect occurs when one takes a prescription vasodilator, such as Nitroglycerin or Viagra).\n\nIt has been reported that the pain can be relieved by moving the tongue to the roof of the mouth, which will cause greater warmth in the region; it is also believed that the pain can be relieved by slowly sipping room temperature water. Laying the head to the side may also provide relief. The pain may be avoided in the first place simply by eating ice cream (or other cold foods or beverages) more slowly.\n\nA report was submitted to the British Medical Journal on brain freeze; it focused on the effect of speed of consumption of ice cream on causing brain freeze. It was co-written by a Canadian grade 8 student (about 13 years old).\n\nIt has been estimated that 30% of the population experiences brain freeze.[1]
1089658
Not necessarily evaporation of sweat.  It is the removal of ambient heat being put off by your body.  On a very cold, but not windy day, you can stand outside without a shirt on and feel somewhat comfortable.  The heat of your body is radiating into the air around you and staying there.  If the wind is blowing, then it is taking heat out of your body faster and making you feel cold.