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Answer:
Intermittant ischemia (deficient blood flow) of the fingers or toes, sometimes also affecting the ears and nose.
The phenomenon in which, a disorder causing discoloration of the fingers, toes, and occasionally nose and earlobes is discussed; is known as Raynaud's Phenomenon.
The classic cause is cold atmosphere; but sometimes mental stress and/or nervousness are the triggers as well.
When patient's body is exposed to cold temperatures,
the blood vessels of affected area starts to constrict.
Once the vessels are reduced in size, the blood flow decreases.
As a result, the skin turns pale or white, because of lack of blood (vasoconstriction).
If the vasoconstriction is more severe the tissues from respective organs, don't get enough oxygen.
So, the nails and/or skin turns blue in colour (hypoxia).
In sever cases, (or in extreme cold atmosphere), the blood/oxygen supply decreases markedly,
this lack of oxygen causes tingling feeling to move on to to become painful feeling.
The phenomenon in which, a disorder causing discoloration of the fingers, toes, and occasionally nose and earlobes is discussed; is known as Raynaud's Phenomenon.
The classic cause is cold atmosphere
When patient's body is exposed to cold temperatures,
the blood vessels of affected area starts to constrict.
Once the vessels are reduced in size, the blood flow decreases.
As a result, the skin turns pale or white, because of lack of blood (vasoconstriction).
If the vasoconstriction is more severe the tissues from respective organs, don't get enough oxygen.
So, the nails and/or skin turns blue in colour (hypoxia).
In sever cases, (or in extreme cold atmosphere), the blood/oxygen supply decreases markedly,
this lack of oxygen causes tingling feeling to move on to to become painful feeling.
First answer by Gale Ency. of Medicine.
Last edit by Raynaudskiran.
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