Through an interview with the patient, delving into his lifestyle, and the symptoms that it presents.
Some hematoanalisis, that would determine factors to consider such as concentration of White Blood cells high, Low Haemoglobin, C Reactive Protein high.
Analysis of Stools,
Then a Study with Colonoscope, where the Specialist can appreciate ulcers, or lesions in the tract colondinal and blind.
It would also be prudent to take a sample of the injured tissue for an analysis patologico