This can be a sensory issue and not anything that is dangerous but if this has been occuring you do need to get in for a dental check as alot of issues with metallic tastes in the mouth and smells such as you are smelling can be caused by gum or dental issues and if you do have gingivitis or chronic gum disease the infection that could be in your gums can spread into other parts of your body and because the ear, nose, and throat are more directly connected this is what can make this more sensitive to your nose. The reason you may notice it more when you have a cold or allergy attacks is most likely because your nose is already a focal point so it is more sensitive during those times. The smell you are smelling is not dangerous but any infection that could be causing the issue can so it is important to make sure and be treated. Of course certain medications can also intestify this as well so that may be why it is more noticable to you during these times as well when you do have periods of irritation as that along with the gum issues combined make this more noticable and why you seem to notice it them.
*Cheryl K* Please click the
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