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.
Depending on the knee ligament sprain or tear, symptoms may vary. With each sprain or tear, pain is usually associated with the injury, as well as swelling and tenderness. The following are common knee ligament sprain and tear symptoms. Keep in mind that each person reacts differently to trauma: Sudden snap or popping noise. Pain in the knee.