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.
Knee Pain (bilateral) Overview. What is knee pain (bilateral)? A person with bilateral knee pain has discomfort in the structures of both knees. Knee pain may be due to injury, inflammation or infection. What are the symptoms of knee pain (bilateral)? Symptoms of a knee pain include knee swelling, knee tenderness, and bruising of the knee.