Humans choose a convenient time and suitable location within tolerable limits to defecate and carry out the act. This requires recognizing the sensation of the urge to defecate beforehand and having time to prepare. Failure to perform this basic function can lead to bowel disorders such as fecal incontinence or constipation. The urge to defecate is crucial for normal bowel function, and anorectal sensory testing aids in evaluating this urge. The most commonly performed test is the simple balloon distension test. For specific patients, the rectal barostat is useful for assessing both motor and sensory function, but facilities equipped with this device are limited, and it is not widely used. As an evaluation of anorectal sensory testing, hypersensitivity may be associated with decreased compliance, capacity, or an exaggerated response to rectal distension. Conversely, rectal hyposensitivity (numbness) is observed in states where the urge to defecate is diminished or absent. However, current balloon distension studies confirm that rectal volume and rectal pressure are not correlated, and that rectal pressure is the primary trigger for rectal fullness sensation. Therefore, developing a simple method to measure rectal pressure during rectal fullness sensation is necessary for accurate diagnosis of the urge to defecate.