Black stools with other digestive symptoms usually suggest the possibility of digestive bleeding due to digestive disorders.
The smell of faeces may also give some clues to the diagnosis of disease; foul-smelling faeces are commonly seen in chronic enteritis, pancreatic disease and ulcerated colon cancer, but other possibilities cannot be ruled out.
None of the aforementioned diseases will heal on their own, so once the manifestation occurs, prompt medical attention should be sought to identify the cause.