Hands always cold: how to explain it?

Cold hands: what is happening in the body?

The sensation of cold hands is most often related to a normal physiological mechanism of thermal regulation.

When the body is exposed to cold, it prioritizes blood flow to vital organs, such as the heart and brain, by reducing blood flow to the extremities. This is known as peripheral vasoconstriction. In practical terms, the small blood vessels in the fingers contract, limiting the supply of warm blood and causing a local drop in temperature, sometimes accompanied by paleness, tingling, or mild numbness. Although this phenomenon is generally temporary and harmless, in some people it can be more pronounced or persist even without exposure to cold, suggesting less efficient vascular regulation. In such cases, cold hands may serve as a warning sign indicating an underlying imbalance of circulatory, metabolic, or neurological origin.

4 minutes to understand your skin. Our dermatological diagnostic guides you toward the ideal skincare for your specific needs. Simple, quick, personalized.

Cause #1 of cold hands: Raynaud’s phenomenon.

Raynaud’s phenomenon is one of the most frequent causes of persistently cold hands. It corresponds to an overreaction of the small blood vessels in the fingers when exposed to cold or to stress. Under the effect of these stimuli, the arterioles suddenly constrict, greatly reducing or even temporarily interrupting the local blood flow. This vasoconstriction typically presents as a change in finger color: they first turn white (ischemia), then sometimes bluish (lack of oxygen), before becoming red again when blood flow returns. These episodes may be accompanied by sensations of numbness, tingling, or pain, reflecting the transient hypoxia of the tissues.

Le phénomène de Raynaud. — The Raynaud phenomenon.
Source: SILVA-NUNES J. & al. Case report: Artifactual hypoglycemia: A condition that should not be forgotten. Frontiers in Endocrinology (2022).

Two forms of Raynaud’s phenomenon are distinguished. The primary form, the most common, is generally benign and occurs without an identifiable cause, often in young individuals, particularly women. The secondary form, which is rarer but potentially more severe, is associated with certain underlying diseases, especially autoimmune conditions such as scleroderma or lupus. In this case, episodes may be longer, more painful, and accompanied by skin complications. Management is based primarily on protection from the cold and avoidance of triggering factors, but a medical evaluation is recommended if symptoms are unusual, asymmetric, or worsening.

Cause #2 of cold hands: Impaired blood circulation.

An impairment of blood circulation can also explain the sensation of persistently cold hands. In this case, the small blood vessels—more specifically the capillaries and arterioles—fail to effectively regulate blood flow in response to cold exposure. Normally, after an initial phase of vasoconstriction, the body triggers a reflex vasodilation, called cold-induced vasodilation, which helps warm the tissues. However, in some individuals, this mechanism is reduced or ineffective, preventing adequate rewarming of the fingers after exposure to cold and promoting a prolonged sensation of cold.

The causes of this vascular dysfunction remain only partially understood, but several factors appear to be involved.

An individual predisposition, particularly genetic, may influence how reactive the blood vessels are. In addition, lifestyle-related factors such as smoking, or certain chronic diseases that affect the vessels, can impair endothelial function, meaning the ability of blood vessels to constrict and dilate properly. Finally, nervous system regulation also plays a key role: an imbalance in the autonomic nervous system can heighten vasoconstriction or delay the return to normal blood flow. All of these factors contribute to insufficient perfusion of the extremities, which leads to cold hands, sometimes even in the absence of extreme cold.

Cause #3 of cold hands: Hypothyroidism.

Hypothyroidism is a common cause of sensitivity to cold, which can notably present as persistently cold hands. It corresponds to an insufficient production of thyroid hormones (T3 and T4), which are essential for regulating metabolism. When these hormones are deficient, overall metabolic activity slows down, which reduces the body’s heat production. In response, the body tends to conserve this heat by reducing blood flow to the extremities via peripheral vasoconstriction, leading to a sensation of cold in the hands and feet. This reduction in peripheral perfusion therefore occurs in the broader context of a generalized physiological slowdown.

Beyond cold hands, hypothyroidism is usually accompanied by other suggestive signs, such as persistent fatigue, unexplained weight gain, dry skin, hair loss, and increased sensitivity to cold. Diagnosis is based on blood tests that measure, in particular, TSH and circulating thyroid hormones. Once confirmed, management is based on a thyroid hormone replacement therapy, which helps restore a more active metabolism. With a well‑adjusted treatment, symptoms, including the sensation of cold hands, generally tend to gradually subside.

Cause #4 of cold hands: Anemia.

Anemia corresponds to a decrease in the number of red blood cells or in the hemoglobin concentration, which limits the blood’s ability to transport oxygen to tissues. It can result from different causes, including iron, vitamin B12 or folate deficiencies, blood loss, or certain chronic diseases. When oxygen supply becomes insufficient, the body prioritizes blood flow to vital organs at the expense of the extremities. This redistribution of blood flow, together with reduced cellular energy production, contributes to the sensation of cold in the hands, often accompanied by fatigue and pale skin.

Physiological data confirm this link between anemia and peripheral cooling. A study conducted in 78 men, using the xenon-133 clearance method to assess skin blood flow, showed that decreases in hematocrit and hemoglobin levels were accompanied by a significant reduction in cutaneous blood flow. In other words, the less oxygen the blood carries, the less effective the perfusion of peripheral tissues becomes, which may result in a decrease in hand temperature. Management is based on identifying the cause of the anemia: iron or vitamin supplementation may be necessary, as well as treatment of any underlying disease. Gradual correction of the anemia generally improves peripheral circulation and reduces the sensation of cold.

Only a healthcare professional can diagnose anemia, so it is best to consult a doctor before starting any self-directed supplementation.

Cause #5 of cold hands: Peripheral artery disease.

Peripheral arterial disease is a condition characterized by a narrowing of the arteries, most often related to atherosclerosis, that is, the progressive buildup of fatty plaques on the vessel wall. This process limits blood flow to the limbs, particularly the extremities, which can result in a persistent feeling of cold in the hands, and even more commonly in the feet. This reduced perfusion is sometimes accompanied by other symptoms, such as numbness, weakness, or pain during exertion, due to an insufficient supply of oxygen to the tissues. Cold exposure can worsen these manifestations by increasing the existing vasoconstriction.

The risk of developing peripheral artery disease increases with age and in the presence of certain cardiovascular risk factors, including smoking, diabetes, high blood pressure, or elevated cholesterol levels. Studies have shown that vascular function is significantly impaired in affected individuals, reflecting a loss of the blood vessels’ ability to adapt to the body’s needs. Management is based primarily on reducing risk factors, including smoking cessation, regular physical activity, and an appropriate diet. Medications may be prescribed to improve blood flow and prevent complications, such as antiplatelet agents and lipid-lowering drugs, and in more advanced cases, procedures such as angioplasty or bypass surgery may be considered to restore adequate blood flow to the extremities.

Cause #6 of cold hands: Diabetic neuropathy.

Diabetic neuropathy is a common complication of diabetes, caused by progressive damage to the peripheral nerves due to chronic hyperglycemia. It can affect both the sensory nerves, which are responsible for sensations, and the autonomic nervous system, which regulates, among other things, blood circulation and skin temperature. When these mechanisms are impaired, the perception of cold may be heightened or, conversely, misinterpreted, while vascular regulation becomes less effective. The result is insufficient perfusion of the extremities and a persistent sensation of cold hands, often associated with tingling, numbness, or reduced sensitivity.

Beyond discomfort, diabetic neuropathy is a major complication of diabetes that can significantly affect quality of life and increase the risk of skin injuries.

Its assessment is based on a clinical examination that combines the analysis of peripheral and autonomic nervous system functions, as these two types of involvement are frequently associated. Management is organized around several key components: strict blood glucose control to slow the progression of nerve damage, lifestyle and dietary measures, treatments aimed at relieving neuropathic pain, and strategies designed to improve peripheral circulation. Appropriate management not only helps limit symptoms, such as cold hands, but also preserves nerve and vascular function over the long term.

Cause #7 of cold hands: Smoking.

Smoking is a well-established factor in disruption of blood circulation, which can contribute to the sensation of cold hands. Nicotine causes immediate vasoconstriction, narrowing blood vessels and limiting blood flow to the extremities. Over the longer term, tobacco impairs the function of the endothelium, the thin layer of cells lining the inside of blood vessels, notably by decreasing the production of nitric oxide, a key mediator of vasodilation. This endothelial dysfunction prevents blood vessels from adapting properly to the body’s needs, especially in response to cold, which promotes insufficient blood perfusion of the hands.

These mechanisms were demonstrated in a study conducted in 1993 that evaluated endothelial function in 200 healthy adults. The researchers measured flow-mediated dilation (FMD) of the brachial artery, an indicator of the vessels’ ability to dilate in response to an increase in blood flow. The results showed that smokers had significantly reduced FMD compared with non-smokers, reflecting a marked impairment of endothelial function. This impairment was dose-dependent: the greater the exposure to tobacco, the more FMD decreased. Former smokers showed partial improvement, suggesting that some vascular damage may be reversible after quitting smoking. Interestingly, endothelium-independent vascular responses remained intact in all groups, indicating that the problem lies mainly in endothelial regulation, rather than in the structure of the vessels.

4 ± 3.9%

FMD of smokers.

10 ± 3.3%

FMD in non-smokers.

5.1 ± 4.1%

FMD in former smokers.

In practice, this means that in smokers, blood vessels have more difficulty dilating to warm the extremities after exposure to cold, which maintains the sensation of cold hands.

Cause #8 of cold hands: Vasoconstriction caused by certain medications.

Certain medications can also promote the sensation of cold hands by inducing peripheral vasoconstriction. This is particularly the case with beta‑blockers, used in hypertension or certain cardiac conditions, with some migraine treatments such as ergot derivatives or triptans, and with stimulants prescribed for ADHD. These substances act by modulating the nervous system or vascular receptors, which can reduce blood flow to the extremities. If cold hands appear or worsen after starting a treatment, it may be helpful to discuss this with a healthcare professional in order to assess any possible connection and adjust management if necessary.

Key point : Most often benign, cold hands can, when frequent or persistent, nevertheless reveal an underlying imbalance that it is important to identify in order to adapt management appropriately.