A 30-year-old man surnamed Yang in Henan, China, recently collapsed and died in the toilet at home one morning, leaving behind a large family with young children. Critical care specialist Huang Xuan said that "going to the toilet" is not a simple matter—for the cardiovascular system, it's sometimes like a mini "stress test." There are four critical points that can be fatal when going to the toilet in cold weather.
Dr. Huang explained that straining during bowel movements equals a short-term "surge in blood pressure" and a "rapid drop in blood return to the heart." When constipated or straining, people often hold their breath and strain, which increases chest pressure, impairs venous return, and leads to drastic fluctuations in blood pressure and cardiac blood supply. For people with poor cardiac reserve, coronary artery stenosis, or a tendency towards arrhythmia, this can trigger myocardial ischemia, myocardial infarction, arrhythmia, worsening heart failure, and even increasing the risk of sudden death in vulnerable groups.
Dr. Huang Xuan explained that going to the toilet (defecation/urination) is a typical scenario for "situational syncope." Strong vagal nerve stimulation can cause bradycardia or a sudden drop in blood pressure, potentially causing a person to faint directly on the toilet. If this is accompanied by heart disease, in rare cases it can worsen into more serious cardiac events.
Moreover, it's not just the heart; the sudden increase in blood pressure caused by exertion can be the final straw for certain "rupture events," such as subarachnoid hemorrhage, aortic dissection, and pulmonary embolism.
Dr. Huang Xuan explained that in cold weather, even going to the toilet can be fatal because it often involves changes in posture (blood pressure regulation pressure), exertion, and vagal reflexes. Combined with factors like nighttime, alcohol consumption, dehydration, fever, and medication, all of these can push the body towards the threshold of "hypoperfusion or cardiac instability."
Danger Signals
If someone experiences any of the following before or after using the toilet, do not assume it's a simple fainting spell:
Thunder-like headache, vomiting, altered consciousness.
Tearful chest/back pain, cold sweats.
Shortness of breath, chest tightness, palpitations, coughing up blood, or recent prolonged sitting/surgery.
Recurring dizziness, blurred vision, or near fainting during bowel movements/urination (situational syncope requires evaluation).
4 Deadly Risks When Using the Toilet in Cold Weather
People with coronary heart disease/heart failure/poorly controlled severe hypertension/aortic aneurysm or aortic disease history/recent infection accompanied by chest pain or shortness of breath should be especially careful. "Toilet accidents are not a matter of luck, but a matter of probability." It is recommended to have a systematic evaluation by a doctor in winter, at least an electrocardiogram, blood pressure trend, and medication review; if necessary, echocardiography, Holter monitoring, tilt table testing, etc., to ensure the body is healthy.
Nighttime Toilet Rush: Dr. Huang Xuan says that suddenly standing up from a lying position at night may cause the body's blood pressure compensation to be insufficient, leading to postural hypotension, which can cause dizziness and blurred vision upon standing.
Constipation is a serious issue in cold weather because straining during bowel movements causes significant blood pressure fluctuations, which can be quite stimulating to the cardiovascular system. Studies have also found a link between constipation and the risk of cardiovascular events.
If you experience dizziness/cold sweats/nausea: Stop immediately! Don't push your body: Bowel movement syncope often has warning signs: dizziness, nausea, sweating, and temporary blackouts. Instead of straining more, de-trigger the symptoms. For example, stop straining, sit up straight (call for help if necessary), take deep breaths, and relax (don't hold your breath). If this happens repeatedly or you've previously fallen and injured yourself, seek medical attention.
Preventing accidents during bowel movements:
Avoid straining: Address constipation (fiber, water, regular activity; seek medical attention if necessary).
Don't flush too quickly: Especially at night, sit on the edge of the bed for 30 seconds before getting up.
If you feel dizzy, stop immediately: Don't continue straining; instead, take deep breaths and relax.
High-risk individuals (heart disease, aortic aneurysm, poorly controlled hypertension, recent infection/chest pain): A complete evaluation is recommended.
Dr. Huang Xuan explained that cold weather causes vasoconstriction and fluctuating blood pressure; forceful breath-holding causes drastic fluctuations in venous return and blood pressure; the vagus nerve reflex can also slow the heart rate and cause a sudden drop in blood pressure. He said that while cold weather isn't the direct killer, going to the toilet can easily trigger these conditions, so special attention is needed.
He said that this is especially important for high-risk individuals such as those with coronary heart disease/heart failure/poorly controlled severe hypertension/a known aortic aneurysm or a history of aortic disease/recent infection accompanied by chest pain or shortness of breath. He warned that if you experience a sudden headache, tearing chest and back pain, shortness of breath to the point of being unable to speak in complete sentences, coughing up blood, or altered consciousness, this is not a "fainting"; please go directly to the emergency room or call 119. "You need to go to the toilet safely, not gamble with your life."
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