What are some causes for one being cold all the time?

I am wearing a sweater, pondering wrapping myself within the warmth of a thick quilt, because I am so cold.( It is 78 degrees in here) I even get so desperate I take many warm showers. I read about hypothyroidism, which I am sure is a possibility, due to my anorexic/bulimic/excessive dieting past and still occasional issue, but I would like to know other possibilities. I am not sure if early pregnancy can cause one to be cold, because I a have many symptoms of pregnancy and am unsure if I am or not or if I should add that too the list...I also know anemia is another possibility because I have had it many times before. I know anorexia/bulimia could be another cause but I am not underweight. Any other suggestions? Thank you.