Differential Diagnosis for 3 Days No Bowel Movement

• Single Most Likely Diagnosis
  • Constipation: This is the most common cause of not having a bowel movement for 3 days, often due to low fiber diet, inadequate fluid intake, or lack of physical activity.
• Other Likely Diagnoses
  • Medication side effects: Certain medications such as opioids, anticholinergics, and iron supplements can cause constipation.
  • Dietary factors: A diet low in fiber or high in processed foods can contribute to constipation.
  • Lifestyle factors: Prolonged bed rest, travel, or changes in routine can affect bowel habits.
  • Hypothyroidism: An underactive thyroid gland can slow down bowel movements.
• Do Not Miss Diagnoses
  • Intestinal obstruction: A blockage in the intestine can prevent normal bowel movements and is a medical emergency.
  • Volvulus: A twisting of the intestine that can cut off blood supply and is life-threatening if not treated promptly.
  • Fecal impaction: A condition where stool becomes stuck in the rectum and fails to pass out of the body, which can lead to serious complications if not addressed.
  • Neurological disorders: Conditions such as spinal cord injuries, Parkinson's disease, or multiple sclerosis can affect bowel function.
• Rare Diagnoses
  • Hirschsprung's disease: A congenital condition characterized by the absence of nerve cells in the colon, leading to severe constipation.
  • Chronic intestinal pseudo-obstruction: A rare condition where the muscles in the intestine do not work properly, leading to severe constipation and other symptoms.
  • Colorectal cancer: Although rare, colorectal cancer can cause changes in bowel habits, including constipation, especially in older adults.