Introduction
Some people seem to shiver while others stay comfortable in the same chilly room. Sensitivity to cold varies because of many interacting factors: biology, health, body composition, hormones, circulation, habits, and environment. This article explains why some people feel the cold more than others, what is happening in the body, common causes, and practical ways to feel warmer.
How the body senses and responds to cold
The fundamental reason people feel cold is that skin and internal temperature sensors send signals to the brain about heat loss. Nerve endings in the skin detect temperature changes and relay information to the hypothalamus, a brain region that regulates body temperature.
When the body perceives cooling, it activates several defenses: vasoconstriction (narrowing blood vessels near the skin to reduce heat loss), shivering (rapid muscle contractions that generate heat), and behavioral responses (seeking warmth, adding clothing, or increasing activity). Metabolic processes and hormones also adjust to help maintain core temperature around roughly 37°C (98.6°F).
Major reasons some people feel colder
1. Body composition and fat distribution
Body fat acts as insulation. People with lower subcutaneous fat generally lose heat faster and may feel colder. Conversely, higher fat levels slow heat loss, making it easier to stay warm in cool conditions.
Muscle mass matters too: muscles produce heat when active and contribute to basal metabolic rate (the energy used at rest). People with lower muscle mass often produce less internal heat and can be more sensitive to cold.
2. Circulation and blood flow
Warm blood from the core keeps extremities like hands and feet comfortable. Conditions that reduce peripheral blood flow, such as Raynaud’s phenomenon, peripheral artery disease, or even normal variations in circulation, make the fingers and toes feel colder. Nervous system tone — how strongly blood vessels constrict — differs between individuals and affects cold sensitivity.
Even temporary factors like caffeine, nicotine, dehydration, or prolonged inactivity can reduce peripheral blood flow and increase cold sensation.
3. Metabolism and thyroid function
Metabolism — the rate the body converts food into energy — produces heat. People with faster metabolic rates tend to feel warmer. Thyroid hormones, produced by the thyroid gland, play a major role here. Low thyroid function (hypothyroidism) slows metabolism and commonly causes increased sensitivity to cold, along with fatigue and weight gain.
While clinical thyroid disease is a medical condition, milder variations in thyroid activity and metabolic rate also exist across the population and contribute to differences in cold tolerance.
4. Hormones and sex differences
Hormones influence temperature perception. For example, estrogen can promote vasodilation (widening blood vessels), which may change how heat is distributed. Women commonly report feeling colder than men in similar environments; partly this reflects differences in body composition (generally lower muscle mass and different fat distribution) but also hormonal cycles and average metabolic rates.
Menopause and menstrual cycle phases can alter temperature perception. Progesterone and estrogen shifts influence both core temperature and blood flow, so some people notice increased sensitivity to cold at certain times.
5. Age-related changes
Older adults often feel colder for several reasons: reduced muscle mass, thinner skin, slower circulation, and sometimes decreased activity. The ability to regulate temperature can weaken with age, and certain medications common in older populations may affect blood vessels or metabolism, increasing cold sensitivity.
6. Health conditions and medications
Several health issues can make someone feel cold more often. Examples include anemia (low red blood cell count), which reduces oxygen delivery and can cause chills; diabetes, which can cause nerve damage and poor circulation; and autoimmune diseases that affect circulation or metabolism.
Many medications also influence temperature perception. Beta-blockers, some antidepressants, and drugs that affect the thyroid or blood vessels can make people more sensitive to cold. Always consult a healthcare professional if you suspect medication is contributing to symptoms.
7. Nervous system sensitivity and perception
Temperature sensation is subjective and processed in the brain. Two people in the same room may report different comfort levels because their nervous systems interpret the same signals differently. Chronic pain conditions or sensory processing differences can change how temperature is perceived.
8. Lifestyle, habits, and acclimatization
People who live in colder climates or spend a lot of time outdoors often become partially acclimatized, meaning their bodies adapt to cold exposure by improving circulation, metabolism, and behavioral responses. Conversely, people who spend most time in warm indoor environments may feel cold more readily when exposed to lower temperatures.
Habits such as diet, activity level, sleep, and clothing choices also shape cold sensitivity. Regular physical activity increases muscle mass and circulation, helping with warmth. Poor sleep and low calorie intake can reduce heat production and increase cold tolerance problems.
Common examples that illustrate these factors
Two office colleagues sit in the same air-conditioned space: one layers a sweater, the other wears short sleeves. The person who feels cold might have lower muscle mass, be mildly anemic, or be on medication that reduces peripheral circulation. Small differences in metabolism and body fat can produce distinct comfort levels.
An elderly neighbor keeps the thermostat higher and wears several layers indoors. Age-related loss of muscle, thinner skin that loses heat faster, and possible medications together explain why older adults often require more warmth.
A long-distance runner acclimatized to chilly morning runs steps outside briskly and remains comfortable, while a friend who exercises little feels cold quickly. The runner’s higher muscle mass and regular exposure to cool conditions both help retain warmth.
When to seek medical advice
Feeling cold occasionally is normal. However, consult a healthcare professional when cold sensitivity is new, severe, or accompanied by other symptoms such as persistent fatigue, unexplained weight changes, numbness in the fingers or toes, color changes in extremities, dizziness, or changes in appetite.
Some treatable conditions — like hypothyroidism, anemia, or circulation problems — may present with increased cold sensitivity. A clinician can evaluate symptoms, ask about medications, run basic blood tests (such as thyroid function and complete blood count), and recommend appropriate management or referrals.
Practical steps to feel warmer
There are many safe, practical measures to reduce cold discomfort in daily life:
Dress in layers. Layers trap air and allow you to adjust to changing temperatures. Start with a moisture-wicking base layer, add insulating middle layers (wool, fleece), and finish with a windproof outer layer if needed.
Keep hands and feet warm. Wear warm socks and gloves; consider slippers with good insulation at home. A hat reduces heat loss from the head because a significant amount of body heat can escape from an uncovered head.
Stay active. Light exercise boosts circulation and generates heat. Even short walks or simple movements at your desk help warm muscles and raise comfort levels.
Eat regularly and include warm foods. Digesting food produces heat (diet-induced thermogenesis). Warm drinks and nutrient-dense meals support metabolism and comfort.
Adjust your living space. Use rugs, curtains, and draft stoppers to reduce heat loss. Localized heating (space heaters, heated blankets) can warm the immediate environment efficiently, but use them safely and according to manufacturer instructions.
Check medication effects. If you suspect a medication is contributing to cold sensitivity, consult your healthcare provider before changing any prescription.
Myths and clarifications
Some common misconceptions about feeling cold are worth clarifying. Myth: “Only people with low body fat feel cold.” While body fat affects insulation, many other factors—circulation, hormones, health conditions, and acclimatization—also matter.
Myth: “Shivering always means hypothermia.” Shivering is a normal heat-generating response. Hypothermia involves dangerously low core body temperature and symptoms such as confusion, very slow heartbeat, and loss of coordination. Feeling cold alone is not the same as hypothermia.
Myth: “If you feel cold, you must have a serious illness.” Increased sensitivity to cold is common and often explained by benign causes like low physical activity, temporary changes in circulation, or being unacclimatized. However, persistent or new-onset sensitivity warrants medical evaluation to rule out treatable conditions.
Summary of key points
Feeling more sensitive to cold than others usually results from a combination of factors: lower insulation (body fat), lower heat production (muscle mass and metabolism), reduced peripheral circulation, hormonal or thyroid differences, age-related changes, medical conditions, medication effects, and lifestyle or acclimatization differences.
Many practical steps—layered clothing, keeping extremities warm, staying active, eating regularly, and improving home insulation—help reduce discomfort. If cold sensitivity is new, severe, or comes with other concerning symptoms, seek medical advice for evaluation and appropriate testing.
Conclusion
People vary in how they experience cold because many biological and lifestyle factors influence heat production, insulation, and circulation. Understanding these causes helps explain why two people in the same room may feel very different temperatures. Simple measures often improve comfort, and medical evaluation can identify treatable causes when sensitivity is persistent or accompanied by other symptoms.
