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.
Causes of Knee symptoms (Knee problems) The list of medical condition causes of Knee symptoms (Knee problems) includes: 49,XXXXY syndrome - knock-knee. Absent patellae -- scrotal hypoplasia -- renal anomalies -- facial dysmorphism -- mental retardation - absent or underdeveloped kneecaps.