Conditions that cause people to be cold all the time include anemia, hypothyroidism and anorexia nervosa, according to WebMD. Some people have a natural tendency to be cold because of body composition or lack of body fat, but those who experience additional symptoms such as nausea or fatigue may have a medical condition, notes Dr. Andrew Weil. If medical conditions are ruled out, a person who is cold often may have cold sensitivity, which is triggered by stress.
Anemia occurs when a person does not have enough hemoglobin in his blood, notes Cleveland Clinic. There are many forms of anemia, which all lead to symptoms such as feeling cold, having pale skin, feeling tired and being weak. The most common cause of anemia is a lack of iron, which is due to various factors such as blood loss, poor diet and pregnancy.
Hypothyroidism occurs when the thyroid gland produces an inadequate amount of thyroid hormone, explains MedlinePlus. Many factors contribute to this disorder, including autoimmunity, viral infection and pregnancy. An increased sensitivity to the cold is an early symptom of hypothyroidism, which leads to symptoms of slow speech and hoarseness if it is not treated.
Anorexia nervosa is an eating disorder that leads to various symptoms, including a sensitivity to the cold, depression and a fear of gaining weight, according to MedlinePlus. Doctors do not know what causes anorexia nervosa but believe that genetic and hormonal factors play a role.