List possible differential diagnosis of pain in the left upper quadrant
1. Gastritis
2. Peptic ulcer disease
3. Gastroesophageal reflux disease (GERD)
4. Pancreatitis
5. Splenic infarction or rupture
6. Left-sided pneumonia or pleurisy
7. Left kidney stone or infection
8. Left-sided ovarian cyst or torsion
9. Left colonic diverticulitis
10. Left adrenal gland pathology (e.g., adrenal tumor)
11. Left rib fracture or muscle strain
12. Angina or heart attack
13. Costochondritis (inflammation of the cartilage connecting the ribs to the sternum)
14. Left-sided diaphragmatic hernia
15. Left-sided gallbladder disease (e.g., cholecystitis or gallstones)
16. Left upper quadrant hernia
17. Spleen enlargement or splenomegaly
18. Left-sided lymphadenitis
19. Left-sided appendicitis (when appendix is in an abnormal position)
20. Left gastric artery aneurysm or dissection