Almost all of us would have cried sometime or the other in our lives, and you would see tears coming out (slightly salty). It pains a mother to see her child crying, but consider how horrific a mother would have felt when she would have seen her child crying out tears of blood for the first time. This is a medical condition which is somewhat rare, but happens (link to article):
The Tennessee boy cries blood uncontrollably, sometimes three times a day, and doctors cannot tell him why.
"Sometimes, I can feel it coming up, like a tear. I feel my eyes watering," Inman told ABC News affiliate WATE. "Sometimes, it will burn as it comes out."