### Patient: Doctor, I have been experiencing some symptoms lately. I feel like my kidneys are not functioning properly, and I also feel shortness of breath. Additionally, I have noticed a black tarry stool, and I tend to feel cold most of the time.
### Doctor: Based on your symptoms, it seems like you are suffering from anemia due to chronic kidney disease. The shortness of breath and feeling cold is a common symptom of anemia, and the black tarry stool can be a result of gastrointestinal bleeding caused by it. We need to investigate further and begin treatment as soon as possible.