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We human beings generate heat in our body during muscle movement, metabolism, etc. Most of this heat is used to maintain our body temperature and keep us warm.
However, some people always feel cold. This might be because they are suffering from hyperthyroidism. In hyperthyroidism, our thyroid gland which regulates metabolism does not function properly. As a result, our metabolism slows down and less heat is generated due to which we feel cold.
Another possibility is a disorder called Raynaud's disease. When a person having this disorder is stressed or is exposed to cold conditions, the arteries of his hands and legs become narrow. Hence, warm blood is not transported efficiently to his hands and legs, making his extremities feel cold.
In addition to this, less muscle mass, low iron levels and smoking may also make some people always feel cold.
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