We often assume our bodies will send a clear signal when something is seriously wrong. Something like a sharp pain, a persistent cough, or a h**h fever. But a sobering online thread posed a terrifying question: what’s one condition that can have no symptoms but can be instantly fatal?

The responses, many from medical professionals and those who have lost loved ones, are a chilling look at the "silent killers" that can lurk undetected in seemingly healthy people. These are the medical time bombs that can strike without warning. If this isn’t a reminder of the fragility of life, what is?

Discover more in 28 Of The Deadliest Diseases Doctors Say There Are No Symptoms For

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My grandfather died from a pulmonary embolism. He had no sym

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