Genetic conditions can arise from changes in a single gene, several genes or the number or structure of chromosomes. Some are inherited from a parent, while others result from a new genetic change. Their symptoms and effects can vary, even between people with the same condition.

Browse individual conditions to learn about their main features, how common they are, the genetic changes involved and how they may be passed down through families. If you are concerned about symptoms or your family history, a healthcare professional can help you understand whether genetic testing or specialist advice may be appropriate.