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Fibrous dysplasia

Fibrous dysplasia is a congenital (present at birth) condition that affects bone growth and development. Instead of maturing into solid bone, affected bones stay at the immature fibrous stage so are weak and misshapen.This page from Great Ormond Street Hospital (GOSH) explains the causes, symptoms and treatment of fibrous dysplasia and where to get help.

Food allergy

Food allergy is a type of food hypersensitivity where the body’s immune system has a reaction to a substance that is usually harmless, resulting in the release of a number of chemicals into the bloodstream. Common foods causing an allergy in children include: cow’s milk, eggs, shellfish and peanuts. Substances that cause an allergic reaction are called allergens.

Food intolerance 

Food intolerance is a type of food hypersensitivity that is very different to food allergy. Food allergy and food intolerance are often confused. A food allergy provokes a response from the immune system, but food intolerance does not. 

Freeman-Sheldon syndrome

This page from Great Ormond Street Hospital (GOSH) explains the causes, symptoms and treatment of Freeman Sheldon syndrome (previously known as Whistling Face syndrome) and where to get help. Freeman-Sheldon syndrome is a rare genetic condition that affects the mouth, face, hands and feet.


Gallstones are stone-like formations found in the gallbladder. They can vary significantly in size, shape and consistency, and they can be present without causing any problems at all. This information sheet from Great Ormond Street Hospital (GOSH) explains about gallstones, what causes them and how they can be treated using an operation to remove the gall bladder (laparoscopic cholecystectomy).

Gastro-oesophageal reflux

When a baby or child has gastro-oesophageal reflux, the food and drink travels down the foodpipe as normal. However, some of the mixture of food, drink and acid travels back up the foodpipe, instead of passing through to the large and small intestines. As the food and drink is mixed with acid from the stomach, it can irritate the lining of the foodpipe, making it sore. This is gastro-oesophageal reflux disease.