A randomized, controlled trial was conducted with two parallel groups. In the physiotherapy group, physiotherapy exercises will be employed (isometric training of the abdominal muscles, diaphragmatic breathing exercises and abdominal massage) together with conventional treatment (disimpaction, when necessary, a high-fiber diet, laxatives and toilet training). Patients in the medication group will be only submitted to conventional treatment. Disimpaction will be conducted with phosphate saline solution (once a day, from one to five days, according to patient needs). During toilet training, the patient will be instructed to sit on the toilet for at least five minutes, with support for the feet, after the three main meals of the day.