I'm 33 yrs old and have been healthy all my life. I just recovered from a right lung fungal mass that caused my pulmonary artery to bleed. no chest pain, no shortness of breath, no fever, nothing. that fungal infection in my right lung grew slowly over time until it started to infiltrate my pulmonary artery. first symptom, coughing up blood that was pouring out my nostrils. I was going to bleed to death if I didn't have surgery. the doctors said "you must have inhaled this histoplasmosis fungus in the air from somewhere and your immune system didn't fight it off"
on another note, my dad told me that his mom (my grandmom) hemorraged death in the 1940's. he doesn't remember what she hemorrhaged from because he was only about 4 years old at the time.