Is Sickle Cell Worse in Cold Weather? Causes, Ice Packs & Tips
Yes, for many people sickle cell disease is worse in cold weather. Cold is one of the best-known triggers for a sickle cell crisis: it narrows blood vessels, which makes it easier for sickled cells to block blood flow. The NHS lists sudden changes in temperature alongside dehydration and stress as things that can bring on a crisis, and advises people with sickle cell disease to dress warmly in cold weather and avoid getting into very cold water (NHS). Winter doesn't have to mean months of crises, though. Most of what helps is simple, and it works best as a routine rather than something you remember once you're already cold.
Why does cold weather trigger a sickle cell crisis?
When you get cold, your body narrows the blood vessels near the surface of your skin, especially in your hands, feet, ears and nose, to keep heat in your core. For most people that's harmless. In sickle cell disease, red blood cells can become stiff and sickle-shaped, and narrower vessels make it easier for those cells to get stuck and block blood flow. That blockage is what causes the pain of a vaso-occlusive crisis (NHLBI).
It isn't only cold itself. US guidance lists both extreme heat or cold and sudden changes in temperature as common triggers, which is why stepping from a hot room into freezing air, or jumping into cold water, can be a problem (NHLBI). Wind and wet clothes make things worse, because they pull heat away from your body faster.
How can I stay warm without overheating?
The goal is to keep your body temperature steady, not to bundle up so much that you sweat and then chill.
- Dress in layers. A thin base layer, a warm middle layer and a windproof outer layer let you add or remove warmth as you move between outdoors, buses and heated rooms.
- Cover the parts that lose heat fastest. A hat, gloves, scarf and warm socks matter more than you'd think, since hands, feet and ears are where blood vessels narrow first.
- Stay dry. Change out of wet clothes or damp socks as soon as you can. Wet fabric chills you far faster than dry.
- Watch for cold indoors too. Air conditioning in offices, cars and plane cabins is the same sudden drop in temperature, so keep a layer with you when you travel, even in summer.
- Warm up gradually. Coming in from the cold, warm up with a warm (not scalding) drink, blankets and a warm room rather than a very hot shower straight away.
- Plan for waiting. Bus stops, school runs and queues are where people get caught out. A spare pair of gloves and a hand warmer in your bag can make a real difference.
- Keep your home warm enough. If heating costs are a worry, focus on keeping one room warm and ask your GP, haematology team or a charity like the Sickle Cell Society about support with winter costs.
Should I use ice packs for sickle cell pain?
No. Use warmth instead. Guidance on managing a crisis at home recommends applying heat to the painful area with a heating pad or warm compress (NHLBI), and the NHS advice to avoid very cold water applies to pain too. Ice packs and cold compresses can make blood vessels narrow further, so they're generally avoided in sickle cell disease.
Keep heat comfortable rather than hot. Wrap heat packs or hot water bottles in a cloth, don't fall asleep on a heating pad, and check your skin regularly, especially if pain makes it hard to tell how hot something is.
Does winter raise the risk of infection too?
Yes, and for people with sickle cell disease that matters. Infections can trigger crises, and many people with sickle cell disease are more vulnerable to serious infections. A few winter habits help:
- Get your flu vaccine every year, and keep other recommended vaccines up to date. People with sickle cell disease are advised to have a yearly flu vaccine (NHLBI), and the NHS offers it free to people with long-term conditions (NHS).
- Keep taking any preventive antibiotics you've been prescribed, such as penicillin.
- Wash your hands often and avoid close contact with people who are clearly unwell where you can.
- Treat a fever as urgent. The NHS advises calling for emergency help if you have sickle cell disease and a high temperature (NHS).
Should I still drink plenty of water in winter?
Yes. It's easy to drink less when it's cold because you feel less thirsty, but dehydration is a crisis trigger all year round. Heated rooms dry the air, and illness with fever or vomiting increases fluid loss. Warm drinks count. Tea, hot water with lemon and soup all add to your fluids, though it's worth keeping caffeine moderate. Our guide to sickle cell water intake covers how much to aim for.
Winter checklist
- Layers, hat, gloves, scarf and warm socks before you leave the house
- A spare pair of gloves and a hand warmer in your bag
- A water bottle or flask with you
- Flu vaccine booked
- Heat pack or hot water bottle ready at home (no ice packs)
- Your crisis plan up to date and saved on your phone
- Your haematology team's number to hand
- you have severe pain with breathing difficulties, or you're being sick
- you have sickle cell disease and a high temperature
- you have an erection that is painful or will not go away
Do not drive yourself to A&E. (NHS)
Frequently asked questions
This guide is general information, not medical advice. Always follow the plan agreed with your own care team. Read our medical disclaimer.
Related guides
What causes a sickle cell crisis, the common triggers, early warning signs to watch for, and practical steps to lower your risk — based on NIH and NHS guidance.
Why water intake matters with sickle cell disease, what public health guidance says, signs of dehydration, and how to build a realistic daily habit.
An honest look at the symptom tracker apps, free pain diary apps, reminders and support tools people with sickle cell and other chronic illnesses use in 2026.