Why am I always cold? Common causes and when to see a doctor
Feeling cold all the time is often a normal difference in how your body conserves heat, shaped by body size, activity and clothing. Persistent or worsening cold can also come from hypothyroidism, anemia, very low body weight, Raynaud's phenomenon or other blood vessel problems. If cold intolerance is long-term, extreme or comes with fatigue or other new symptoms, see a clinician.
Is it normal to always feel cold?
Often, yes. Your body defends a core temperature of about 37 degrees Celsius (98.6 degrees Fahrenheit), within roughly half a degree, and it does this by adjusting how much warm blood flows through the skin. When the hypothalamus senses cold, it narrows skin arterioles so blood bypasses the surface and less heat escapes. Hands and feet feel that change first.
People vary in how readily this happens. Sitting still, a thin build, damp clothing and drafty or air-conditioned rooms all shift the balance toward feeling cold. None of that is a disease.
Clinicians use the term cold intolerance when sensitivity to cold is abnormal for the setting. MedlinePlus describes it as an abnormal sensitivity to a cold environment and notes that it can point to a problem with metabolism.
What medical conditions make you feel cold all the time?
MedlinePlus lists several causes of cold intolerance that clinicians commonly consider. Each tends to come with other clues, which is why describing your whole picture helps.
Hypothyroidism: an underactive thyroid slows metabolism. NIDDK lists trouble tolerating cold alongside fatigue, weight gain, dry skin, thinning hair and a slowed heart rate, and reports that nearly 5 out of 100 Americans ages 12 and older have it.
Anemia: NHLBI lists cold hands and feet, fatigue, dizziness and pale skin among the symptoms of more serious iron-deficiency anemia. Heavy periods, gut conditions and some kidney disease raise the risk.
Raynaud's phenomenon: episodes of pale or white, then blue and red fingers or toes, set off by cold or stress.
Anorexia nervosa or very low body weight, which leaves less insulation and less fuel for heat production.
Problems with the hypothalamus, the brain's temperature control center.
Chronic severe illness or general poor health.
Why am I always cold and tired?
Cold and fatigue together is the pairing most worth mentioning to a clinician, because it fits both hypothyroidism and anemia. Both are common, both are identified with blood tests, and both are manageable once found.
Poor sleep, low food intake and some medicines can also leave you tired and chilly. Keep a short diary for two weeks that notes when you feel cold, how tired you are, and any changes in weight, periods or bowel habits. It makes the appointment far more productive.
Why am I cold even when it is warm?
Feeling cold in a warm room usually reflects cool hands and feet rather than a cold core. Air conditioning is a recognized trigger for Raynaud's episodes, and moving from a hot street into a chilled building is exactly the kind of sudden change that sets off symptoms.
If you feel cold in warm settings most days, especially with other symptoms, that is a reasonable reason to be checked for thyroid or blood problems.
What will a doctor check?
According to MedlinePlus, a clinician will take a history and examine you, asking when the cold began, what you eat, your general health and other symptoms. Tests may include a complete blood count, a comprehensive metabolic panel and thyroid tests (TSH, T3 and T4).
If your hands or feet change color, the clinician may also look for signs of Raynaud's or a related condition, and ask about medicines, smoking and work with vibrating tools.
When should you see a doctor about always feeling cold?
Talk to your clinician if cold intolerance is long-term, extreme or new. Seek care sooner if you notice any of the following.
Fatigue, weight change, dizziness, shortness of breath or chest pain alongside feeling cold.
Fingers or toes that turn white or blue and do not recover after warming.
Sores or breaks in the skin on fingers or toes.
Symptoms on one side of the body only.
Numbness, tingling or reduced ability to feel heat and cold.
How can you stay warm while you find the cause?
Practical warmth still matters while you wait for answers. Focus on keeping your whole body warm: several thin layers, a warm hat, and a layer over the torso make a noticeable difference to how the hands and feet feel. Carry a spare layer for cold offices and air-conditioned shops.
Warm drinks, regular movement and mittens rather than gloves outdoors help too. At home, warming the bed before you get in and wearing socks at night can make evenings more comfortable. If you have diabetes or any numbness, use heat sources with care, since skin that cannot feel heat well is easier to burn, and check with your clinician before using heated clothing or pads.
Key takeaways
Feeling cold is often a normal variation, driven by how the body narrows skin blood vessels to protect core temperature.
Hypothyroidism and anemia are common medical causes, especially when cold comes with fatigue.
Color changes in fingers or toes suggest Raynaud's or a related condition.
A clinician can usually start with an exam and simple blood tests.
Keep the whole body warm while you look for a cause, and take care with heat if sensation is reduced.
Frequently asked questions
Can low iron make you feel cold?
Yes. NHLBI lists cold hands and feet among the symptoms of more serious iron-deficiency anemia, along with fatigue and pale skin. A blood test can check for it.
Is being always cold a sign of thyroid problems?
It can be. Trouble tolerating cold is a recognized symptom of hypothyroidism, often with fatigue, weight gain and dry skin. Thyroid blood tests can confirm or rule it out.
Why am I always cold at night?
Body temperature and activity fall at night, and lying still produces less heat. Socks, a warm base layer and warming the bed beforehand usually help. If night-time cold is new or severe, mention it to a clinician.
Do women feel colder than men?
Many women report feeling colder, and some causes of cold sensitivity are more common in women. The Raynaud's Association reports that women are affected by Raynaud's nine times more often than men, and NIDDK notes hypothyroidism is more common in women.
Should I worry if my hands are always cold?
Cold hands alone are usually normal. See a clinician if they change color, develop sores, feel numb, or are much colder on one side than the other.
Related reading
Sources
Cold intolerance, MedlinePlus Medical Encyclopedia, U.S. National Library of Medicine
Hypothyroidism (Underactive Thyroid), National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Iron-Deficiency Anemia, National Heart, Lung, and Blood Institute (NHLBI)
Physiology, Temperature Regulation (StatPearls), NCBI Bookshelf, National Library of Medicine
Raynaud's disease: Symptoms and causes, Mayo Clinic
Frequently Asked Questions, Raynaud's Association
About HEATJAC. HEATJAC is a thermal architecture company founded by an anesthesiologist. We design patented garment systems that capture, conduct and broaden warmth across the body, and we publish this knowledge hub because the science of staying warm should be public. HEATJAC products are not medical devices and are not intended to diagnose, treat, cure or prevent any disease.