Why Stroke Cases Spike In Winter: Neurologist Warns About Early Morning Danger

The number of stroke cases increases dramatically in winter due to the vasoconstrictive effect of cold weather, which leads to blood vessel narrowing and increased blood pressure, a major risk factor for stroke. Neurologists have warned that the early morning hours are the most dangerous, as the sudden drop in temperature between 6-10 am leads to a sudden increase in blood pressure, particularly in hypertensives and the elderly. Other contributing factors include the thickening of blood due to dehydration, the loss of thirst in cold weather, and the increased incidence of viral infections such as the flu, which leads to clotting and inflammation. A sedentary lifestyle in winter further aggravates obesity and cholesterol.

This is further exacerbated by vitamin D deficiency due to reduced sunlight exposure, making the cardiovascular system more susceptible, and hormonal changes that put additional strain on the heart. In conversation with The Daily Jagran, Dr Anjani Kumar Sharma, Director – Neurosciences, CK Birla Hospitals Jaipur, states the reason behind spike in winter strokes.

Why Cold Weather Affects the Brain

When temperatures fall suddenly, our body reacts by narrowing blood vessels to conserve heat. This narrowing increases blood pressure. Dr Anjani Kumar Sharma states, “High blood pressure is one of the strongest risk factors for stroke.” “Cold weather also makes blood thicker, increasing the chances of clot formation, which can block blood flow to the brain and cause an ischemic stroke,” she adds.

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In people who already have conditions like hypertension, diabetes, high cholesterol, or heart disease, this risk becomes even higher.

Early-Morning Hours: A High-Risk Time

Early mornings, typically between 5 am and 9 am, are especially dangerous. At this time, blood pressure naturally rises as the body prepares to wake up. In cold weather, this rise becomes sharper. Dr Anjani Kumar Sharma mentions, “Combined with low temperatures, dehydration, and sudden physical activity like brisk walking or bathing in cold water, the risk of stroke increases.”

Many stroke patients report symptoms soon after waking up or while doing morning chores.

Stroke Increases In Winter (Image Credits: Canva)

Who Should Be Extra Careful?

Elderly individuals, smokers, people with uncontrolled blood pressure, diabetics, and those who have had a previous stroke or heart attack need to be particularly cautious. Skipping medications, inadequate winter hydration, and ignoring early warning signs further add to the danger.

Simple Steps To Reduce Risk

Keep yourself warm, especially in the early morning. Avoid sudden exposure to cold air or cold water. Do not skip blood pressure or diabetes medications. Stay hydrated even if you don’t feel thirsty. Gentle stretching is better than sudden, intense exercise in winter.

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Stroke can happen suddenly, but it is often preventable. Cold weather is not just uncomfortable; it can be dangerous if ignored. If symptoms like sudden weakness, slurred speech, facial drooping, or confusion appear, seek medical help immediately. Timely action can save life and brain function.