Cold hands and feet

Cold hands and feet are very common and usually not a sign of illness — the body naturally reduces blood flow to the extremities to conserve core heat when it is cold or when you are anxious, and some people simply run 'cold' with a slim build or low body fat. However, persistently cold extremities can sometimes point to an underlying cause: anaemia (less haemoglobin to carry oxygen and warmth), an underactive thyroid (a slowed metabolism, with tiredness and cold intolerance), and, in a specific pattern, Raynaud's phenomenon — where cold or stress triggers the small vessels in the fingers or toes to clamp down, so they turn white, then blue, then red and painful as blood returns. Raynaud's is usually harmless (primary), but occasionally is linked to an autoimmune condition. In older adults or smokers, cold, painful feet with poor pulses can indicate reduced arterial circulation (peripheral arterial disease). Smoking, some medications and low body weight all contribute.

• Normal response to cold or stress — the commonest reason; not a disease.
• Slim build, low body fat, naturally 'cold' constitution.
• Raynaud's phenomenon — fingers/toes turn white then blue in the cold; usually harmless, occasionally linked to autoimmune disease.
• Anaemia — with tiredness, pallor and breathlessness.
• Underactive thyroid (hypothyroidism) — with cold intolerance, tiredness, weight gain.
• Smoking and some medications (e.g. beta-blockers).
• Peripheral arterial disease — in older adults or smokers, with painful feet and poor pulses.

Cold hands and feet usually need no tests when they are a lifelong tendency without other symptoms. Testing is guided by accompanying features: a full blood count and ferritin if anaemia is suspected (tiredness, pallor), and TSH with free T4 for an underactive thyroid (cold intolerance, weight gain, fatigue). If a Raynaud's pattern comes with joint pains, rashes or other features suggesting autoimmune disease, tests such as ANA and inflammatory markers may be added. In older adults or smokers with painful, cold feet, the circulation is assessed clinically rather than by blood tests. Mediora.AI can surface an anaemia or thyroid pattern from your results when the picture fits; the assessment belongs with your doctor.