Celiac disease is a hereditary condition, meaning it runs in families. When a person with it eats gluten, it can damage the valli on the intestinal lining in the small intestine which help absorb nutrients, so without them, your body can't get enough nutrients. This can cause depression and anxiety, bone and joint pain, canker sores and dry mouth, and irritability, especially in children. Unfortunately, there is no cure, and a person with Celiac disease must refrain from eating gluten for the rest of their life.
Sources:
https://celiac.org/about-celiac-disease/what-is-celiac-disease/
Gallstones are hardened pieces of bile in a persons gall bladder. They are common and mostly found in woman. They do not always cause problems, in-fact, many people don't even know they have them, but if they get stuck in a persons biliary track, they can cause serious problems and must be surgically removed. Most people only report seeing signs if there is a blockage. That can look like, upper abdominal pain, yellow tint to skin or eyes or nausea. Gallstones can form when there is a main ingredient in bile. The extra can settle towards the bottom and form hardened stones over time.
Sources:
https://my.clevelandclinic.org/health/diseases/7313-gallstones
Sources:
https://my.clevelandclinic.org/health/diseases/10138-esophagitis