A stroke is a disruption of blood flow to your brain which leads to its death within minutes. There are multiple studies that have shown that colder temperatures increase the risk of brain stroke. A recent study presented at the American Heart Association International Conference further revealed that risk of hospitalization due to stroke increases by 6% for every five-degree decrease in temperature. An increased risk of stroke during the winter months may occur for the following reasons:Colder weather causes blood vessels to constrict because of an increase in vasoconstrictors like noradrenaline. This raises the blood pressure, a major risk factor for stroke. Winter or colder weathers also increase the likelihood of platelet aggregation and tilts the balance of clotting and clot lysis, making it easier to clot. A blockage in a blood vessel to the brain caused by blood clots is one of the main causes of stroke. Humidity is also known to play a major role in an increased stroke risk. High humidity in the atmosphere can cause some people to become dehydrated, increasing the risk of blood clot formation. As humidity rises, so does the stroke risk, with a two percent increase for every five-degree rise in dew point.Lack of sunlight exposure and a sedentary lifestyle can both increase the risk of stroke. Sunlight is main source of Vitamin D, which is pivotal to health of blood vessels. Meanwhile, lack of physical activity can hamper regular circulation of blood. Cold weather also increases the risk of serious systemic infections in the elderly, increasing susceptibility to brain stroke. What Is Stroke?Brain stroke occurs when there is a disruption to the blood flow to your brain. It occurs when a blood vessel in the brain ruptures and bleeds or when there's a blockage in the blood supply to the brain. This impedes the supply of blood, nutrients and oxygen to the brain, prompting brain cells to die within minutes. Stroke is the third largest cause of death in people, after heart attack and coronavirus. The number of people worldwide having a new stroke rose to 11.9 million in 2021—up by 70 per cent since 1990. Meanwhile, stroke-related deaths rose to 7.3 million—up by 44 per cent since 1990.To raise awareness about this serious condition, World Stroke Day is marked on October 29 every year.How To Identify Stroke?According to National Institutes of Health (NIH), the symptoms of stroke appear within minutes, but in many cases, could take hours to appear. Here are the most common signs to identify stroke. Sudden confusion, trouble speaking, or trouble understanding speechSudden numbness or weakness, especially on one side of the bodySudden severe headache with no known causeSudden trouble seeing from one or both eyesSudden trouble walking, dizziness, or loss of balance or coordinationWhat To Do When Someone Gets A Stroke?In case a person gets a stroke, taking quick action is the key. Medics recommend following the BE FAST method of assessment. Here are the details:Balance: Are they having trouble with balance or coordination?Eyes: Are they experiencing visual symptoms, like double vision or blurry vision?Face: Does one side of their face droop if they try to smile?Arms: Can they lift both arms or is one arm weak or numb?Speech: Is their speech slurred or difficult to understand?Time: If any of the above symptoms are present, time to call 911 or your local emergency services.