Infectious and parasitic diseases (A00-B99).
- Tuberculosis (consumption).
- Venereal infections – infectious diseases such as syphilis that are transmitted through sexual intercourse.
Mouth, esophagus (food pipe), stomach, and intestines (K00-K67; K90-K93).
- Anal abscess – encapsulated collection of pus located in the anal canal.
- Anal fistula – abnormal duct connection originating in the anal canal → clarification of Crohn’s disease required; in approximately 40% of cases, this is the first symptom of the disease
- Hemorrhoids
- Crohn’s disease – chronic inflammatory bowel disease; it usually progresses in episodes and can affect the entire digestive tract; characteristic is the segmental affection of the intestinal mucosa (intestinal mucosa), that is, several intestinal segments may be affected, which are separated by healthy sections from each other
Neoplasms – tumor diseases (C00-D48).
- Anal carcinoma – malignant neoplasm in the region of the anus.