Yes! I have something in my nose called a nasogastric tube, or ng tube for short. This tube goes through my nose, down into my throat, and into my stomach. I am then attached to a pump that periodically pumps a liquid diet into my stomach. If I feel hungry, I can speed it up, or if I feel sick I can slow it down. I usually run my tube at about 80-100mL an hour.
I have explained the ng tube, but there are also different types of tubes. a nasojejunal feeding tube is a tube that bypasses everything including up to the stomach, all the way to the jejunum, or the middle part of the small intestine. From what I know, these have to be placed surgically.
There is also one called a gastric tube, or simply a g tube. This one does not go through the nose, but rather is placed on the skin where the stomach is, and the food gets through from there (this isn’t a very good explanation, sorry)
I know I have missed a few, and the explanations are not very good. Here is a site with more information.
There are over 300 reasons for someone to get a tube. The most common ones are for being born prematurely and anorexia nervosa. But assuming is the worst you can do. If your see someone with a tube, ask them about it! Chances are they will be glad you came up to them, and will be happy to answer any questions. If you do get the chance, make sure to thank them for their time.