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.
Dislocated knee Symptoms of knee or kneecap dislocations include pain and swelling in the knee, stiffness, and deformity. Sickle cell crisis Sickle cell crisis causes sudden pain, shortness of breath, low grade fever, nausea, vomiting, or diarrhea.