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A professor has warned of the serious health risks of going to the toilet - including the risk of having a heart attack. Professor of anatomy Michelle Spear said the smallest room is

'occasionally, the most dangerous'. Professor Spear of the University of Bristol said: "At the heart of this peril lies the Valsalva manoeuvre – the act of forcibly exhaling

against a closed airway while straining, such as during defecation. This puts pressure on your chest, which reduces blood flow back to the heart. For most people, it’s harmless. But for

those with heart problems, this strain can lead to “defecation syncope” (fainting), irregular heart rhythms and even sudden death. "The vagus nerve is a key player here. It helps

control your heart rate, and when it becomes overstimulated – through intense straining or pressure in the rectum – it can cause bradycardia (a dangerously slow heartbeat), low blood

pressure and loss of consciousness. This makes defecation a surprisingly high-stakes event for those with underlying heart conditions." Professor Spear, writing in The Conversation,

cited the examples of Elvis Presley and King George II. She said: "Presley, aged just 42, was found collapsed on the bathroom floor of Graceland on August 16, 1977. Though fans

speculated about drug overdose – and it’s worth noting that the full report is withheld until 2027 – the post-mortem narrative reveals a more complex and tragic medical picture.

"Presley had suffered from chronic constipation, possibly exacerbated by a high-fat, low-fibre diet, prolonged opiate use and a 'megacolon' – a pathologically enlarged colon.

On the morning of his death, he was reportedly straining forcefully. The Valsalva manoeuvre may have triggered a fatal arrhythmia in a heart already compromised by years of prescription drug

abuse and poor health. "A more aristocratic death occurred in 1760 when King George II of Great Britain died suddenly after visiting his privy. His physician, Dr Frank Nicholls,

performed a rare royal autopsy and found that the king had suffered a ruptured thoracic aortic aneurysm – a ballooning of the body’s main artery. "The event probably occurred as George

stood up from the toilet, at a moment when blood pressure fluctuated dramatically. Historians and physicians now believe that the effort of defecation or the sudden change in posture may

have been the trigger. The king’s heart was also notably diseased, with significant calcification of the aortic valve, further compounding the risks posed by even minor circulatory

strain." Professor Spear says that, historically, having heart attack is not the only danger linked to toilets. In the 18th and 19th century people would fall in to the cesspits below

the facilities. She said: "Falling into a cesspit wasn’t just revolting, it could be deadly. People who lost their footing, especially in the dark or while drunk, sometimes drowned in

the filth or were overcome by toxic gases like methane and hydrogen sulphide, which are released as waste breaks down. "Newspapers and coroners’ reports from the time reveal a grim

pattern: people – especially children and the elderly – regularly died after falling into night soil pits. In his 1851 classic London Labour and the London Poor, Henry Mayhew vividly

describes the deadly risks faced by night soil men, including suffocation by toxic cesspit gases. "These grim accidents helped drive 19th-century public health reforms and campaigns for

better sewage infrastructure, eventually paving the way for the modern sewers we rely on today." Professor Spear says the danger still exists in parts of the world where 'pit

latrines' are common. And modern technology also poses a risk. Professor Spear said: "Bringing your smartphone to the toilet often means longer sitting times. This increases

pressure on the rectal venous plexus (the network of veins around the rectum), raising the risk of haemorrhoids and anal fissures. "The 'toilet scroll' also poses microbial

dangers. Studies have found that phones used in the bathroom can carry harmful germs from the toilet to your hands – and eventually, your mouth. They can harbour _E coli_ and other pathogens

long after you’ve finished washing your hands. "There’s also the issue of toilet posture. The western-style sitting toilet, unlike the squatting toilets common in parts of Asia and

Africa, places the rectum at an angle that makes defecation more effortful and hence more likely to provoke straining. This is why some people use footstools or “toilet squat platforms” to

adjust their position and reduce the risk of complications. "Whether it’s sudden cardiac death, fainting and falls or microbial exposure, the toilet is not always the sanctuary we

imagine. It’s a space where anatomy, privacy and risk intersect – often unnoticed until something goes terribly wrong. "So the next time nature calls, think twice before settling in

with your phone. Sit smart, don’t strain and remember: even in the smallest room, your body could be handling some surprisingly high-stakes business."