I've noticed spots of blood on the front of my underwear when I wake up in the morning.  Should I be concerned?
D005260:Female; D006417:Hematuria / Q000209:etiology / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008796:Metrorrhagia / Q000209:etiology / Q000503:physiopathology*