Why Winter Is Harder on Your Heart in Abbottabad
Cold raises blood pressure and provokes angina, and heart attacks rise in winter. What changes for heart patients in Abbottabad, and what to do about it.
Last reviewed: by Dr. Muhammad Ali Khan, FCPS Cardiology
Key takeaways
- Cold air narrows blood vessels, which pushes blood pressure up and makes angina more likely. Heart attacks are consistently more common in the winter months.
- The riskiest combination is cold plus sudden exertion first thing in the morning, which is exactly when many people in Abbottabad take their walk.
- Blood pressure genuinely runs higher in winter for many people, and the tablets sometimes need adjusting. That is a decision for your cardiologist, not something to change yourself.
- A gas heater or coal brazier in a closed room is a separate and serious danger. Carbon monoxide starves the heart of oxygen and it gives almost no warning.
- Chest pain in the cold that does not settle within a few minutes of resting and warming up needs 1122 or DHQ Hospital Abbottabad Emergency, not a wait until morning.
Abbottabad gets properly cold. Not Naran cold, but cold enough that January mornings here are a different proposition from January mornings in Karachi, and cold enough that it shows up in the cardiology workload.
Heart attacks are consistently more common in winter than in summer. This is one of the better-established patterns in cardiology, and it holds across countries and climates. Understanding why it happens is most of the work in avoiding it.
What the cold actually does
Blood vessels narrow when you are cold. That is the body protecting your core temperature by keeping blood away from the surface, and it is entirely normal. The side effect is that the same amount of blood is now travelling through a tighter system, so blood pressure rises.
For a healthy heart that is nothing. For a heart supplied by arteries that are already narrowed, it means the muscle is being asked to push harder while its own supply is no better than it was. That is the recipe for angina, and it is why some people find they get chest tightness on a cold walk that never troubles them in July.
Blood also clots somewhat more readily in the cold. Layer on top of that the things that come with the season rather than the temperature: people walk less, eat heavier and saltier food, put on weight over the wedding and winter months, and catch chest infections. A significant infection is itself a recognised trigger for a cardiac event, which is a connection most patients have never heard.
The dangerous half hour
If there is one specific thing to take from this page, it is this: cold plus sudden exertion first thing in the morning is the worst combination, and it is exactly what a lot of people in Abbottabad do.
Blood pressure is naturally at its highest in the hours after waking. Add freezing air, add setting off briskly, and you have stacked three separate stresses on top of each other. The classic version in Hazara is a man in his fifties going out at first light in December to walk fast, or to push a stalled car, or to shovel snow after a heavy fall.
None of that means stop moving. It means change how you start.
- Walk mid-morning rather than at dawn, once the air has lifted
- Cover your nose and mouth for the first few minutes so you are not pulling freezing air straight in
- Start slowly and build up over the first ten minutes
- Treat snow clearing and pushing vehicles as heavy exertion, because that is what they are
The American Heart Association has warned specifically about snow shovelling and cold-weather exertion for people with heart disease for years, and the mechanism is the same one described above.
Blood pressure drifts up, and the tablets may need to follow
Many people find their readings genuinely run higher through the cold months. This is real, not a measurement error.
What matters is what you do about it. Keep taking the tablets exactly as prescribed. Take home readings through the winter and write them down with the date and time beside each one. Bring that record to your appointment, because a page of readings across several weeks is worth far more than one reading taken in a clinic after you have walked in from a cold street.
What not to do is adjust a dose yourself because one morning reading looked alarming. There is more on getting this right in our page on high blood pressure and on ambulatory monitoring, which measures across a whole day rather than at one moment.
The heater problem
This one is not about cold at all, and it is the most immediately lethal thing on this page.
A gas heater or an angeethi burning in a room with the windows and doors shut produces carbon monoxide. Carbon monoxide binds to the blood in place of oxygen, so the blood keeps circulating while carrying far less of what the body needs. The heart, which never stops working, is among the first organs to feel it, and in someone with narrowed coronary arteries it can precipitate a heart attack outright.
The symptoms are treacherous because they are so ordinary: headache, nausea, confusion, sleepiness. People assume they are coming down with something and go to bed, which in a sealed room is the worst possible response.
Leave a window or a vent open whenever anything is burning indoors. Never sleep in a closed room with a heater running. If several people in a house feel unwell at the same time on a cold night, get everyone into fresh air first and ask questions afterwards.
What to watch for
Cold-provoked angina that settles within a few minutes of stopping and warming up is worth reporting at your next appointment, particularly if it is new or happening more easily than before.
Chest pain that does not settle with rest and warmth is a different matter entirely. So is pain that comes with cold sweat, breathlessness or pain spreading to the jaw or left arm. Call 1122 or go to DHQ Hospital Abbottabad Emergency, which runs around the clock. Waiting until morning because it is cold and dark outside and the pain "will probably pass" is how people in this district die of things that were treatable at midnight.
Our guide on when chest pain is a heart attack and when it is not covers how to tell the difference.
Before the cold sets in
The useful appointment is the one in autumn, not the one in February after something has already happened.
Dr. Muhammad Ali Khan, Consultant Cardiologist in Abbottabad, sees patients at both city clinics Monday to Saturday for Rs. 2,000, with follow-up visits at Rs. 1,000, and by online video consultation at Rs. 2,500. Booking is through the appointments page or on 0315 5563036. Bring your winter blood pressure readings if you have started keeping them.
Frequently asked questions
Why do heart attacks happen more often in winter?
Several things stack up at once. Cold air makes blood vessels narrow, which raises blood pressure and makes the heart work harder for the same effort. Blood also clots a little more readily in cold conditions. On top of that, people move less, eat heavier food, and catch chest infections, and a bad infection is itself a recognised trigger for a cardiac event. No single one of these is dramatic. Together, over a Hazara winter, they add up.
Should I stop my morning walk in winter?
No, but move it and change how you start it. The coldest part of the day is around dawn, which is when many people here walk and also when cardiac events cluster. Shift the walk to mid-morning once the air has warmed, cover your nose and mouth for the first few minutes so you are not breathing freezing air straight in, and start slowly rather than setting off at pace. Giving up walking altogether does more harm across a whole winter than the cold does.
Sardi mein blood pressure barh jata hai?
Yes, and it is not your imagination. Blood pressure genuinely runs higher for many people in cold weather because the blood vessels tighten, and readings that were well controlled in summer can drift up by a meaningful amount. Keep taking your tablets exactly as prescribed, record home readings through the cold months with dates and times, and bring them to your appointment. Do not raise or lower a dose yourself on the basis of one bad reading.
Is a gas heater or angeethi in a closed room dangerous for the heart?
Yes, and this kills people in this region every winter. A gas heater or coal brazier burning in a room with the windows and doors shut produces carbon monoxide, which binds to your blood in place of oxygen. The heart is one of the first organs to suffer, and in someone with narrowed arteries it can trigger a heart attack. Early symptoms are headache, nausea, confusion and drowsiness, which are easy to mistake for simply feeling unwell. Always leave a window or vent open, and never sleep in a sealed room with a heater burning.
Should heart patients get a flu vaccination before winter?
It is worth discussing at your autumn appointment. Influenza and chest infections put a real strain on the heart, and the period during and just after a bad respiratory infection carries a raised risk of cardiac events in people who already have coronary disease. That is why vaccination is routinely recommended for cardiac patients in guidelines internationally. Whether it is right for you, and where to get it locally, is a question for your own doctor.
Why might my blood pressure medicine need changing in winter?
Because the same dose can produce a different result in a different season. If cold weather is pushing your readings up consistently over weeks, and home measurements confirm it rather than a single clinic reading, the treatment may need adjusting for those months. This is a decision made with a record in front of you, which is the reason to keep home readings through winter. It is not a reason to double a tablet on a cold morning.
Book a consultation with Dr. Muhammad Ali Khan
Consultant Cardiologist (FCPS Cardiology). Two clinic locations in Abbottabad plus online video consultation across Pakistan. Clinic fee Rs. 2,000, online Rs. 2,500. By appointment only.