Blood is always bloody scary (sorry), but not always bloody serious. Through my cancer treatment, I was often coughing up a (sometimes scary) amount of blood. You get this atavistic reaction like .. something broken inside me .. my body eating itself ... but in my case, my airways were aggravated by an excess of phlegm .. caused by both inflammation and a lack of saliva to push it through my body in the normal way .. so I was coughing a lot .. and the coughing abraded some minor blood vessels .. next thing you know I'm spewing into the sink and seeing blood threaded through it. In that case, really scary, but not serious. When the blood is bright red, apparently you shouldn't be too worried, because its fresh and somewhere near the expellation point .. example bright red blood on your toilet paper more often means haemmorhoids than stomach or bowel cancer ... but where the blood is darker, that apparently should be more of a concern, like a malignancy inside you.
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