<unk>  or<unk>  intolerance is unusual discomfort felt by some people when in a cool environment. There is much variation in the sensitivity to<unk>  experienced by different people, with some putting on many layers of clothing while others in the same environment feel comfortable in one layer.<unk>  may be a symptom of hypothyroidism, anemia, fibromyalgia or vasoconstriction. Also, a lack of vitamin B12 can cause a constant feeling of<unk> . There are other conditions that may cause a<unk>  intolerance, including low body weight, high body temperature and low blood pressure. There may also be differences in people in the expression of uncoupling proteins, thus affecting their amount of thermogenesis. Psychology may also play a factor in perceived temperature.
Cold sensitivity
Oat sensitivity
Multiple chemical sensitivity
Cue reactivity
Killing Season
Antimicrobial spectrum
Tissue tropism
Acid-fastness