This is a prospective study evaluating the effect of a treatment method of sacral neuromodulation (SNM), the use of which is approved and recommended for the treatment of both faecal incontinence (FI) and urinary incontinence (UI). A new aspect of the study is monitoring the effect of SNM in patients with both types of incontinence (faecal and urinary) occurring simultaneously. The study will use diagnostic methods and procedures that are part of the usual examination algorithm. The study will not impose any burden on patients beyond the scope of routine examination and treatment procedures.