It turns out cold hands and feet could be more than just a winter nuisance. Dr Eric Berg, a medical professional with 2.3 million TikTok followers and 14 million subscribers on YouTube, suggested it may have a more serious meaning.

In a viral TikTok video, the expert shared how it's a sign your body is not getting enough of something quite important. Dr Berg bluntly stated: "Cold hands and feet is a B12 deficiency".

Vitamin B12, known widely as cobalamin, is a water-soluble nutrient vital for red blood cell production and nerve health. According to the National Institutes of Health (NIH), it helps prevent anaemia by keeping red blood cells healthy.

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Without enough B12, however, the body can struggle to produce adequate red blood cells. Healthline explains that fewer red blood cells means less oxygen is carried to tissues, which can make extremities feel cold.

B12 is found naturally in animal products such as meat, fish, dairy and eggs. The NHS says vegetarians and especially vegans are at higher risk of deficiency since plant foods typically don't contain B12 unless fortified.

Fortified cereals and yeast can provide B12 for those on plant-based diets. The British Dietetic notes that adults may need fortified foods or supplements to meet their B12 requirements.

The vitamin also supports the nervous system, helping with nerve signalling throughout the body. Cleveland Clinic claims low B12 can also cause numbness, tingling, balance issues, and changes in mood and memory.

Other signs of deficiency include fatigue and weakness to pale skin or shortness of breath. In more severe cases, prolonged deficiency can lead to irreversible nerve damage, as per Medline.

That's not to say cold hands and feet is solely down to low B12. According to the NHS, it is also a symptom of poor circulation, Raynaud's phenomenon, thyroid issues or anaemia and should be ruled out by a healthcare professional.

However, many people, especially older adults, struggle to absorb B12 efficiently from food alone. According to the Office for National Statistics, around one in 10 adults aged 75 and over have lower than normal B12 levels.

If you’re experiencing persistent cold extremities along with fatigue or tingling, doctors say it’s worth discussing B12 levels with your GP. Simple blood tests can check B12 status, and effective treatments include diet adjustments or supplements.