Why Does Cold Weather Make My Joints Ache? What the Research Says

Why does cold weather make my joints ache? If your knees, hands or hips feel stiffer and sorer as the temperature drops, you are not imagining it. Millions of people notice the same pattern every winter, and the largest study ever run on the question found that the link is real. The surprise is that cold itself is only part of the story. Damp air, falling air pressure and strong wind matter more than the temperature on the thermometer, and the cold makes joints stiffer through several separate routes at once. This guide explains what the research actually found, why winter is hard on joints, what genuinely helps, and when aching joints are a reason to see a doctor.

The short answer is that cold weather makes joints ache because cold, damp and changeable weather stiffens the tissues around a joint, thickens the fluid inside it, tightens the muscles that support it, and cuts the amount you move. A landmark UK study of more than 13,000 people with chronic pain found that days with higher humidity, lower atmospheric pressure and stronger winds were more likely to be high pain days. Cold weather does not cause arthritis, and it does not damage your joints, but if your joints are already sensitive, winter can make the pain noticeably worse. The good news is that the same study, and the NHS guidance that follows from it, point to practical steps that help: keep moving, keep warm, and treat a flare early rather than waiting it out.

What the biggest UK study actually found

For centuries, people with arthritis have said the weather affects their pain, and for centuries doctors have been unsure whether to believe them. Earlier studies were small, short, or unable to measure the weather where each person actually was. That changed with Cloudy with a Chance of Pain, a study run by researchers at the University of Manchester’s Centre for Epidemiology Versus Arthritis, funded by Versus Arthritis and published in the peer reviewed journal npj Digital Medicine in 2019.

More than 13,000 people across the UK living with chronic pain, mostly arthritis, took part over 15 months. Each day they logged their pain in a smartphone app, and the GPS in their phone linked each entry to the real weather where they were. The study collected 5.1 million pain reports, far more data than any earlier research on the question. By comparing days when a person’s pain rose with days when it did not, for the same person, the researchers could separate the effect of the weather from everything else about that person.

The findings were clear. Days with higher humidity, lower atmospheric pressure and stronger winds were more likely to be high pain days, in that order. People with long-term conditions were 20 per cent more likely to suffer pain on days that were humid and windy with low atmospheric pressure. Humidity was the strongest factor, then pressure, then wind. Two findings surprised even the researchers. Temperature on its own showed no link with pain when averaged across the whole group, and rainfall showed no link either. Cold days that were also damp and windy could still be more painful, which fits what most people report, but cold alone was not the driver.

The study also checked whether the link could be explained away. Weather affects mood, and mood affects pain, so it would be easy to assume the whole effect was psychological. It was not. Even after accounting for mood and for physical activity, the link between weather and pain stayed. Around three in four people with long-term pain believe weather affects their symptoms, and this study was the first large scale evidence that they are right. It does not prove how the weather causes the pain, only that the link is real and independent. The how is still being worked out, and the leading explanations are below.

Why does cold weather make my joints ache?

There is no single mechanism, and that is part of why the effect feels so stubborn. Several small changes add up on a cold, damp day, and each one pushes a sensitive joint a little further towards pain.

First, falling air pressure. When a spell of bad weather moves in, atmospheric pressure drops. With less pressure pushing in from outside, the tissues around a joint can expand very slightly, including muscles, tendons and the fluid inside the joint. In a healthy joint that tiny expansion means nothing. In a joint already crowded by arthritis, where cartilage has worn thin and the lining is inflamed, that small extra pressure can irritate nerve endings and trigger aching and stiffness. This is the same reason some people feel a flare coming before the rain arrives: the pressure drops ahead of the weather front.

Second, the fluid inside the joint thickens. Healthy joints are cushioned by synovial fluid, which lets the bones glide over each other. In cold weather that fluid becomes thicker and less free flowing. A rheumatologist at Cedars-Sinai put it memorably: joints work best in temperate weather, and when it gets cooler, the synovial fluid that acts like motor oil in the joints becomes more like sludge. A stiffer joint needs more effort to move, and that effort hurts.

Third, cold narrows blood vessels and tightens muscles. To keep your core warm, the body reduces blood flow to the hands, feet and other extremities, which is why fingers and toes go cold first. Less blood flow means less warmth and oxygen reaching the tissues around a joint, and muscles contract and tighten as the body tries to stay warm. Tight muscles pull on already sensitive joints, adding strain and stiffness. The Arthritis Foundation notes that cold can heighten pain sensitivity, slow blood circulation and cause muscle spasms, all of which make an aching joint feel worse.

Fourth, winter changes how you live. Shorter days and cold, wet weather mean less time outdoors, less walking, and more hours sitting still. Inactivity stiffens joints on its own: a joint that does not move loses flexibility, and the muscles around it weaken. Less sunlight also matters. The NHS advises a daily vitamin D supplement from October to March, because sunlight is too weak in a British winter for the skin to make enough, and low vitamin D has been linked to more joint pain and inflammation. Our guide to whether you need vitamin D in November explains who needs the supplement most and how much is enough.

Does cold weather cause arthritis?

No. Cold weather does not cause arthritis, and it does not make arthritis progress faster. What it does is make existing pain and stiffness more noticeable. That distinction matters, because it means winter aches are a management problem, not a sign that your joints are being damaged by the cold.

Arthritis is an umbrella term for conditions that cause pain, swelling and stiffness in the joints. The NHS says the two most common types in the UK are osteoarthritis and rheumatoid arthritis. Osteoarthritis is wear and tear: the cartilage cushioning the joint wears down over time, most often in the knees, hips and hands, and it is most common over the age of 45. Rheumatoid arthritis is an autoimmune condition in which the immune system attacks the lining of the joints, causing inflammation, and it can affect people at any age. More than 10 million people in the UK live with arthritis, according to Arthritis UK, and people with both main types often report that their symptoms get worse in winter.

The difference between the two matters for what helps. Osteoarthritis pain tends to be worse with use and eases with rest, while rheumatoid arthritis often brings long morning stiffness that improves as the day goes on. But the winter pattern is shared: cold, damp and changeable weather makes both feel worse, and keeping the joint warm and moving helps both. If you do not know which type you have, or you have never had your joint pain assessed, that is itself a reason to book a GP appointment, because the treatments are different.

What actually helps when the cold sets in

There is no cure for weather related joint pain, but there are steps that reliably make winter easier, and they are the same steps rheumatologists and physiotherapists recommend all year round, applied with a bit more care in the cold.

Keep moving, even when you do not feel like it. Exercise is one of the best ways to manage arthritis: it eases pain, increases joint strength and flexibility, and lifts mood. That is the advice of Arthritis UK, and it holds in winter. The trick is to warm up slowly, because a cold, stiff joint dislikes being rushed. Start with gentle movement indoors: marching on the spot, slow knee bends, shoulder rolls, and a few minutes of stretching before you go out. Walking counts, and it counts a lot: a Norwegian study of 11,194 adults found that walking more than 100 minutes a day was linked to a 23 per cent lower risk of chronic low back pain, and the same habit keeps knees and hips supple. Our guide to how much walking per day protects your back explains how to build up to it safely.

Keep the joint warm. Layers trap warm air better than one thick jumper, and gloves, a hat and warm socks matter because the body cuts blood flow to the extremities first. Thermal layers, heated gloves and knee supports help some people, and a hot water bottle or a heat pack on a stiff joint for 15 to 20 minutes can loosen it before activity. A warm shower or bath in the morning is one of the simplest ways to ease overnight stiffness: heat increases blood flow and relaxes the muscles around the joint. Some people find a warm paraffin wax bath helps stiff hands, though it is worth asking a physiotherapist before trying it.

Plan around the weather, not against it. The Cloudy study found that damp, windy, low pressure days are the worst, so on those days it makes sense to do the gentler version of your routine: indoor stretching, a shorter walk, or a swim in a heated pool, which many people with arthritis find easier than walking because the water supports the joints. Save the heavier tasks, such as gardening or a long shopping trip, for drier days. Pace yourself across the week rather than cramming everything into one good day and paying for it the next.

Look after the basics that winter undermines. Keep your home warm enough to move comfortably, and avoid sitting in one position for long stretches: stand, stretch and change position every half hour or so. Eat regularly and keep a healthy weight, because extra weight loads the knees and hips and makes winter stiffness worse. Keep up with sleep, because poor sleep lowers pain tolerance, and get outside in daylight when you can, even on a grey day, for the light and the movement. If you catch a cold, rest and treat it properly: a week of inactivity after a winter bug is a common trigger for a joint flare. Our guide to treating a cold at home covers the remedies that work and the signs that mean you should call 111.

Over the counter pain relief can help on bad days, used as the packet directs. Paracetamol and anti-inflammatory gels are the usual first choices, and your pharmacist can advise which suits you, especially if you take other medicines. Do not start a new prescription medicine, a supplement or a joint injection on your own say so, and be wary of products that promise to cure arthritis or to make joints weatherproof. No supplement has been shown to stop weather related pain, and money spent on miracle cures is money not spent on the things that work: movement, warmth and pacing.

When joint pain needs a doctor

Most winter joint aches are a nuisance, not an emergency. But some patterns need prompt medical attention, and the NHS is specific about which ones. Ask for an urgent GP appointment, or get help from NHS 111, if you have severe pain and swelling in just one joint that started suddenly, if your pain does not get better with painkillers such as paracetamol, if the skin around your joint is red or hot, if you have sore joints with a high or low temperature or you feel hot, cold or shivery, or if you have sore joints with conjunctivitis or sore eyes and problems with your vision.

See your GP, without the same urgency, if you have unexplained pain, swelling or stiffness in your joints that does not go away in a few days, or if stiffness lasts more than 30 minutes after waking on most days. A single hot, swollen joint with a fever can be a joint infection, which needs hospital treatment quickly, so do not wait to see whether it settles on its own. Call 999 if joint pain follows a serious injury and you cannot move the joint or bear weight on it, or if you have signs of a stroke or chest pain alongside it.

It is also worth booking a routine GP appointment if your winter aches are new this year, if they are steadily getting worse, if they stop you doing everyday things, or if you have never had your joints assessed. A GP can check for inflammatory arthritis, gout and other causes, arrange blood tests or an X-ray if needed, refer you to physiotherapy, and review your pain relief. Early treatment of inflammatory arthritis makes a real difference to long term outcomes, so a new pattern of joint pain is not something to put off until spring.

Frequently asked questions

Why do my joints hurt more in winter than in summer?

Winter brings the exact combination the research links to more pain: higher humidity, lower air pressure and stronger winds, plus cold that thickens joint fluid, tightens muscles and narrows blood vessels. People also move less in winter, which stiffens joints on its own. The largest UK study found damp, windy, low pressure days were the most painful, while temperature on its own and rainfall showed no link.

Can cold weather damage my joints?

No. Cold weather does not cause arthritis and does not make it progress faster. It makes existing pain and stiffness more noticeable, which is uncomfortable but not damaging. Keeping joints warm and moving protects them far better than avoiding the cold altogether.

Why do my knees ache before it rains?

Air pressure usually drops before a spell of wet weather, and falling pressure can let the tissues around a joint expand very slightly. In a joint already sensitive from arthritis, that small change can irritate nerve endings and cause aching. The Cloudy with a Chance of Pain study found low pressure days were more likely to be high pain days, though rainfall itself showed no link with pain.

Does vitamin D help joint pain in winter?

Low vitamin D has been linked to more joint pain and inflammation, and the NHS advises a daily vitamin D supplement from October to March because winter sunlight in the UK is too weak for the skin to make enough. A supplement will not cure arthritis, but correcting a deficiency removes one factor that can make winter aches worse.

Should I rest my joints when they ache in the cold?

Short rest on a bad day is sensible, but long rest makes joints stiffer and weaker. Gentle movement is one of the best treatments for arthritis pain: warm up slowly, move little and often, and choose low impact activity such as walking, swimming or stretching. If pain is severe, sudden, or comes with a hot swollen joint or a fever, get medical help rather than resting it out.

Sources

University of Manchester, Centre for Epidemiology Versus Arthritis: Cloudy with a Chance of Pain, investigating the link between weather and chronic pain. https://www.bmh.manchester.ac.uk/stories/investigating-weather-chronic-pain/
Cloudy with a Chance of Pain study: 13,000 UK participants, 15 months, 5.1 million pain reports; higher humidity, lower pressure and stronger winds linked to high pain days. https://www.cloudywithachanceofpain.com/
NHS: Arthritis, symptoms, urgent advice and when to see a GP. Page last reviewed 19 January 2026. https://www.nhs.uk/conditions/arthritis/
Cedars-Sinai: Why is arthritis worse in the winter? Synovial fluid thickening in cold weather. https://www.cedars-sinai.org/stories-and-insights/expert-advice/arthritis-worse-in-winter-winter
Which?: Winter making your health problems worse? 7 conditions cold weather can affect, citing Arthritis UK on more than 10 million people in the UK living with arthritis. https://www.which.co.uk/news/article/health-conditions-cold-weather-can-affect-anbZf6Y12M9X