The purpose of this study is to investigate the attachment of a transparent hood ("cap") on the sigmoidoscope. The investigators hypothesis is that this will reduce pain, reduce investigation time, and increases the success rate of the sigmoidoscopy. The study focus on the less-experienced endoscopist.

The investigators randomize study subject to sigmoidoscopy +/- the attachment of the cap.

Using a 100mm VAS scale the investigators record pain when the sigmoidoscopy reaches its intubation end-point (60cm from anus). The investigators also register the time spent to this point and the rate of examinations not achieving this endpoint.

Inclusion Criteria:

• planned to undergo sigmoidoscopy
• informed consent

Exclusion Criteria:

• use of iv medication for pain and/or anxiety immediately before the endoscopy
• lack of indication for a full sigmoidoscopy (eg just need to investigate the rectum)
• lack or improper administration of standard bowel preparation