Feeling cold when others around you are comfortable — persistent cold hands and feet, chills without fever, or an inability to warm up regardless of ambient temperature — is a symptom that is frequently dismissed but consistently points to identifiable and treatable causes. The medical term is cold intolerance, and it reflects either reduced heat production, impaired circulation, or heightened temperature sensitivity.
Hypothyroidism: The Most Important Cause to Exclude
Thyroid hormones are the primary regulators of metabolic rate — the speed at which cells produce heat from energy. When thyroid hormone levels fall, basal metabolic rate decreases, producing the classic triad of feeling cold, fatigue, and weight gain. Cold intolerance from hypothyroidism is characteristically persistent (not episodic), affects the whole body, and is accompanied by other hypothyroid symptoms: constipation, dry skin, hair thinning, slow heart rate, and low mood. A TSH blood test diagnoses hypothyroidism; levothyroxine replacement fully resolves cold intolerance in most patients.
Anaemia
Red blood cells carry oxygen to tissues for energy metabolism. When haemoglobin concentration is reduced — from iron deficiency, vitamin B12 deficiency, or chronic disease — less oxygen reaches peripheral tissues, impairing thermogenesis and producing cold extremities alongside fatigue and pallor. Iron-deficiency anaemia produces cold hands and feet through two mechanisms: reduced oxygen delivery and a direct effect of iron deficiency on vascular function independent of haemoglobin levels.
Raynaud's Phenomenon
A vasospastic disorder in which cold temperatures or emotional stress trigger exaggerated constriction of small arteries in the fingers, toes, ears, or nose, causing them to turn white (ischaemia), then blue (deoxygenation), then red (reperfusion) — the classic triphasic colour change. Primary Raynaud's (not associated with another condition) affects up to 20% of young women and is benign. Secondary Raynaud's is associated with autoimmune diseases (lupus, scleroderma, rheumatoid arthritis) and requires investigation. Management: keep extremities warm, avoid cold triggers, wear gloves; calcium channel blockers (nifedipine) reduce episode frequency in moderate-to-severe disease.
Poor Circulation and Peripheral Artery Disease
Reduced blood flow to the extremities from atherosclerosis (peripheral artery disease) causes cold, pale, or painful legs and feet — particularly with exertion (claudication). PAD is a cardiovascular risk equivalent; its presence indicates widespread atherosclerosis requiring aggressive risk factor management (smoking cessation, statin therapy, antiplatelet agents).
Low Body Weight and Low Muscle Mass
Body fat is an insulating layer; skeletal muscle is the primary site of shivering thermogenesis. Very lean individuals and those with reduced muscle mass (sarcopenia) have intrinsically lower cold tolerance. This is why older adults and those with eating disorders are disproportionately cold-sensitive.
Other Causes
- Diabetes and peripheral neuropathy: Nerve damage impairs temperature sensation and autonomic regulation of blood flow.
- Low blood pressure: Reduces peripheral perfusion and skin temperature.
- Eating disorders (anorexia nervosa): Severe caloric restriction and low body weight dramatically reduce metabolic heat production — cold intolerance is a core feature.
- Vitamin B12 deficiency: Impairs peripheral nerve function and can contribute to cold hands and feet.
Sources
- Garner R, et al. Raynaud's Phenomenon. BMJ. 2015.
- American Thyroid Association. Hypothyroidism Brochure. 2023.
- Mayo Clinic. Cold hands — Causes. 2023.