How do they do a feeding tube insertion?

Several kinds: Temporary tube through nose is just lubricated and eased in from a nostril down into stomach or first part of intestine. Most common longer-term solution is peg or pej tube placed endoscopically under sedation, similar to egd scope for ulcers, etc. Sometimes a permanent tube has to be placed with open surgery under general anesthesia, typically if complex abdominal or intestinal problems.