A few examples, depending on what you're looking for!
The X-ray machine can check for fractures;
The bone densitometer can check if there is a calcium deficiency in the bones;
The blood cell analyzer can diagnose anemia;
The biochemical analyzer can check for high and low levels of blood glucose;
CT and MR***vibrations can see the images of various sections of the body;
PET/CT can diagnose malignant tumors
The better answer for direct pain relief. Anesthesia machines can help with anesthesia, which also uses anesthetics.
There is also the Han analgesia machine, which uses electrical stimulation. Note that it is "Han's" not "Korean".