Endoscopy vs catheterization?
Quick answer
Endoscopy is an optical device examining body tracts (GI, respiratory, joints) via a natural orifice or small incision. Catheterization uses a tube via artery/vein for diagnosis or treatment (cardiac cath).
Note: This answer is for educational purposes and does not replace a consultation with a specialist who examines your case in person. Do not use it for self-diagnosis.