Differential Diagnosis for 79 year old female with constipation over a week

• Single most likely diagnosis
  • Constipation due to medication side effects (e.g., opioids, anticholinergics, iron supplements): This is a common cause of constipation in the elderly, especially if they have recently started new medications.
  • Hypothyroidism: Constipation is a common symptom of hypothyroidism, which is more prevalent in older adults.
• Other Likely diagnoses
  • Dietary factors (e.g., low fiber intake, dehydration): Inadequate fluid and fiber intake can contribute to constipation.
  • Immobility or decreased physical activity: Reduced mobility can lead to constipation due to decreased bowel motility.
  • Neurological disorders (e.g., Parkinson's disease, stroke): Neurological conditions can affect bowel function and lead to constipation.
• Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
  • Colorectal cancer: Although less likely, colorectal cancer can present with constipation, and missing this diagnosis could be fatal.
  • Bowel obstruction: A bowel obstruction can cause severe constipation and is a medical emergency.
  • Spinal cord compression: Compression of the spinal cord can cause constipation, among other symptoms, and requires prompt attention.
• Rare diagnoses
  • Gastrointestinal motility disorders (e.g., gastroparesis, intestinal pseudo-obstruction): These conditions are less common but can cause significant constipation.
  • Endocrine disorders (e.g., hyperparathyroidism, pheochromocytoma): Certain endocrine disorders can lead to constipation, although they are rare.
  • Amyloidosis: This rare condition can affect the gastrointestinal system and cause constipation.