That being said, it’s still worth getting checked out if you’re cold all the time but don’t feel like anything else is amiss, Dr. Besson says. Your doctor will likely look at your medical records and ask about how often you’re cold, along with teasing out any other symptoms you may not have noticed, Dr. Vyas says. That can help determine what kind of testing might be necessary to land on a diagnosis, if any.2. You have hypothyroidism.Hypothyroidism is a condition in which your thyroid does not produce sufficient levels of the hormones that regulate your metabolism, which in turn slows it down, according to the Mayo Clinic. This can happen for various reasons, the most common being Hashimoto’s disease, an autoimmune disorder that prompts your immune system to attack your thyroid, according to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).Since a slow thyroid affects a bunch of metabolic functions, hypothyroidism can cause a wide range of symptoms including fatigue, unintended weight gain, constipation, dry skin, thinning hair, a depressed mood, heavy or irregular periods, and—that’s right—an increased sensitivity to cold, per the NIDDK. Dr. Besson points to fatigue as the usual tip-off, so if your energy levels are dragging and no amount of fuzzy sweaters can keep you warm, you should definitely mention that to your doctor.Treatment for hypothyroidism involves taking a daily dose of a synthetic replacement for thyroid hormone (thyroxine or T4) called levothyroxine. You’ll also need ongoing blood tests to ensure your hormone levels are up to par once you start treatment, so it may take some time to find the right dose for you.13. You have anemia.Anemia is a blood disorder that happens when you don’t have enough healthy red blood cells to carry oxygen throughout your body, according to the American Society of Hematology (ASH). There are many types of anemia, but the most common one stems from iron deficiency, according to the Mayo Clinic. When you don’t have enough iron in your blood, you can’t make sufficient hemoglobin, a protein that allows your red blood cells to transport oxygen and carbon dioxide. This leads to less circulation to your limbs, causing you to feel colder, Dr. Vyas says, particularly in your hands and feet. Other common anemia symptoms include weakness, fatigue, an irregular heartbeat, paler skin, chest pain, and headaches.2Anemia can also be the result of your body making too few red blood cells, destroying too many red blood cells, or losing too much blood for some reason, the U.S. National Library of Medicine explains. Blood loss due to heavy periods can cause anemia, as can pregnancy, which increases your blood volume. (This is why iron is a key component of prenatal vitamins.) Other forms of anemia are connected with deficiencies in folate and vitamin B-12, which are necessary for producing red blood cells. Genetics can also be to blame, such as with the chronic illness sickle cell anemia.The cause of anemia determines the treatment, the goal of which is to increase your levels of healthy red blood cells by addressing the underlying condition or deficiency. This can involve taking iron supplements, making dietary changes to get more folate or vitamin B-12, or more intensive methods such as blood transfusions if you have a chronic condition.24. You have Raynaud’s disease.Raynaud’s disease is a condition that causes your extremities to become cold, discolored (red or blue), numb, and even painful when you’re in cold temperatures or stressed out. “It happens because your blood vessels are constricting,” Dr. Besson explains.