Left Lateral Position Versus Supine Position in Colonoscopy

Inclusion Criteria: * Patients with indication for colonoscopy in our coloproctology service * Both women and men * Patients within an age range of 18-79 years * Patients who agree having a colonoscopy and who sign the informed consent to participate in the protocol Exclusion Criteria: * Patients under 18 or over 80 years old * All patients that won´t like to participate in the protocol or won´t sign the informed consent * Pregnant women * Patients with a medical record of colonic resection, ostomy status, severe cardiopulmonary and renal diseases, major psychiatric disorders, therapeutic colonoscopy or any contraindications for colonoscopy * Non compliance with the colonic preparation regimen * Active bleeding during the procedure * Patients with a known diagnosis of colorectal cancer * Patients with class III obesity Elimination criteria: * Boston score \<6 for colonic preparation * Patients with a colonic lesion that makes it difficult to pass the colonoscope * Patients with insufficient sedation that requires the procedure to stop temporarily * Bowel perforation during colonoscopy * Inability to reach the cecum despite loop reduction maneuvers * Indication to suspend the study given by the anesthesiologist