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.
A. An ACL injury -- or other ligament injury -- is sometimes hard to diagnose. Symptoms of a knee ligament injury are: 1  Pain, often sudden and severe. 2  A loud pop or snap during the injury. 3  Swelling. 4  A feeling of looseness in the joint.5  Inability to put weight on the point without pain.. An ACL injury -- or other ligament injury -- is sometimes hard to diagnose. Symptoms of a knee ligament injury are: 1  Pain, often sudden and severe. 2  A loud pop or snap during the injury. 3  Swelling. 4  A feeling of looseness in the joint. 5  Inability to put weight on the point without pain.