What could be reasons to always being cold even if its not cold outside or in the house?

Cold: Cold intolerance might suggest sn underactive thyroid.

Something internally: Primary reynaud's syndrome is processi triggered by exposure to cold air or water, sets off a constriction of tiny vessels in peripheral tissues (finger, toes, ear, nose). Cold all the time? Something going on inside ur body (no trigger): secondary reynaud's is same process but some internal disorder is causing it: cold agglutinin, lupus, sjogren's, scleroderma. Complex. Internist..Rheumatologist..