In the case of hematochezia, the blood may coat the stool, be mixed in with the stool, or even be passed by itself without any stool at all. Potential causes of black colored stools include: acidified blood (blood from higher in the digestive tract)
The most common symptoms of a meniscus tear are: 1  Knee pain. 2  Swelling of the knee. 3  Tenderness when pressing on the meniscus.  Popping or clicking within the 1  knee. Limited motion of the knee joint.
The typical symptoms of a posterior cruciate ligament injury are: Pain with swelling that occurs steadily and quickly after the injury; Swelling that makes the knee stiff and may cause a limp; Difficulty walking; The knee feels unstable, like it may give out