A curious case was published in the Journal of Emergency Medicine, one which has never been seen before. It involved a 17-year-old boy from the U.S. who was hospitalized with stabbing chest pains. A pain that was getting stronger and stronger and was preventing him both from lying down and taking deep breaths.Doctors assume heart diseaseAt the first examination, everything suggested that the boy had heart disease - the doctors suspected that the heart muscle was inflamed because his protein levels were also elevated, as is the case with this condition.After some tests, the ECG finally showed what was causing the boy's heart pain. Thankfully, it was not a heart defect that was causing the pain. The ECG actually showed that there was a foreign body made of metal is stuck 3.5 centimetres deep in the 17-year-old's heart.Metal in the heart causes confusionThe doctors immediately performed open-heart surgery and removed a pin from the boy's heart. Fortunately, this did not damage the vital organ and spared the rest of the boy's body.But how could something like this even happen? How could he have possibly swallowed a pin without his knowledge? Only a questioning would shed light on the matter: the 17-year-old likes to sew his own clothes in his spare time and he often puts pins between his lips when he touches the fabric.Not the first timeEven if he can't remember swallowing the pin, this may have happened unnoticed while sewing. It is not the first time that dangerous and sharp objects have been swallowed - like the man who swallows coins. But swallowing a needle unnoticed is, at least medically, the first case, Sciencealert reports.