Differential Diagnosis for Dull Pain on Left Side

Given that urinary tract infection (UTI) and gynecological causes have been ruled out, the following differential diagnoses can be considered:

• Single Most Likely Diagnosis
  • Constipation or Gastrointestinal Issues: Dull pain on one side can be associated with constipation, especially if the pain is localized to the lower left side, which could indicate a full colon or issues with bowel movements.
• Other Likely Diagnoses
  • Musculoskeletal Issues: Strains or overuse of muscles in the back or abdominal wall can cause dull pain on one side.
  • Gastroesophageal Reflux Disease (GERD): Although more commonly associated with heartburn, GERD can cause chest and abdominal pain that might be perceived as dull pain on the left side.
  • Diverticulitis: Inflammation of the diverticula in the colon, which is more common on the left side, can cause dull pain.
• Do Not Miss Diagnoses
  • Kidney Stone: Although UTI has been ruled out, a kidney stone on the left side could cause severe, dull pain that radiates to the groin.
  • Pancreatitis: Inflammation of the pancreas can cause severe abdominal pain that might be perceived as dull and could be localized to the left side.
  • Spleen Issues (e.g., Splenomegaly or Splenic Infarct): Problems with the spleen can cause pain in the upper left abdomen.
  • Pulmonary Embolism: While more commonly associated with sudden onset of shortness of breath and chest pain, in some cases, a pulmonary embolism can cause referred pain to the left side of the abdomen.
• Rare Diagnoses
  • Splenic Artery Aneurysm: A rare condition that could cause left-sided abdominal pain due to the risk of rupture.
  • Left-Sided Diaphragmatic Hernia: A rare condition where abdominal contents herniate through the diaphragm, potentially causing left-sided pain.
  • Intestinal Obstruction: Although more commonly presents with severe abdominal pain and vomiting, a partial obstruction could cause dull pain on one side.

Each of these diagnoses should be considered based on the patient's full clinical presentation, including additional symptoms, medical history, and the results of any diagnostic tests that have been performed.