Complications of haemorrhoids:

The treatment of haemorrhoids is generally free of complications. The following complications may nevertheless occasionally occur as a result of the disease itself or in association with the treatment:

• bleeding from the anus as a result of damage to the rectal mucosa
  
• formation of fissures and fistulae in the anal and rectal region (see link)
  
• development of a contact allergy as a result of use of topical haemorrhoid products with sensitisation to the ingredients
  
• occurrence of irritant anal eczema as a result of frequent use of substances and measures that irritate the skin (e.g. washing with soap)
  
• anal venous thromboses may develop after sclerotherapy (see link)
  
• anal prolapse may occur with longstanding haemorrhoids (see link)