Faecal Incontinence With Faecal Urgency

This study aims to assess and evaluate the clinical efficacy of an intensified form of Percutaneous tibial nerve stimulation (PTNS) compared to standard conservative treatment for low anterior resection syndrome (LARS). A syndrome with symptoms such as faecal incontinence (FI), urgency to defecate and frequent bowel movements. Focus will be mainly on patients with significant faecal incontinence. Participants will be randomized into 2 groups: Standard Care with bowel regulation or to High Intensive PTNS for 6 weeks. Every treatment session will be at the clinic and take 30 minutes. Standard care PTNS participants will have nurse contact once per week for 6 weeks High Intensive PTNS participants will start with 5 sessions per week, which will the be phased out to 2 sessions per weeks during the 6 week period. Follow up visits to the clinic will be at 3, 6 and 12 months after completion of study. Patients in the Standard group whose symtoms have not improved significantly, will be given the option to try the High Intensive treatment option.

The goal of this observational study is to learn why some patients develop low anterior resection syndrome (LARS) after colorectal cancer treatment. The study also aims to identify different subtypes of LARS and understand which patients may respond to specific treatments. The main questions it aims to answer are: * What physiological and imaging changes are associated with LARS? * How do patients with LARS differ from patients without LARS after colorectal cancer surgery? * Are there measurable differences between LARS, patients treated with organ-preserving chemoradiotherapy, and patients with fecal incontinence? Participants will: * Complete advanced physiological and imaging assessments related to bowel function * Be compared with four control groups: * patients without LARS after colorectal cancer surgery * patients treated with organ-preserving chemoradiotherapy * patients with fecal incontinence and urge fecal incontinence * Take part in a single study visit where all measurements are performed