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Cystic fibrosis is an inherited condition in which the lungs and digestive system can become clogged with thick, sticky mucus.
It can cause problems with breathing and digestion from a young age. Over many years, the lungs become increasingly damaged and may eventually stop working properly.
Most cases of cystic fibrosis in the UK are now identified through screening tests carried out soon after birth. It's estimated that 1 in every 2,500 babies born in the UK has cystic fibrosis.
A number of treatments are available to help reduce the problems caused by the condition, but unfortunately average life expectancy is reduced for people who have it.
This page covers:
Symptoms of cystic fibrosis tend to start in early childhood, although they can sometimes develop very soon after birth, or may not be obvious until adulthood.
Some of the main symptoms of cystic fibrosis can include:
Read more about the symptoms of cystic fibrosis.
Cystic fibrosis is caused by a faulty gene that a child inherits from both of their parents.
The faulty gene affects the movement of salt and water in and out of cells. This, along with recurrent infections, can result in a build-up of thick, sticky mucus in the body's tubes and passageways.
To be born with cystic fibrosis, a child has to inherit two copies of this faulty gene – one from each of their parents. Their parents will not usually have the condition themselves, because they will only carry one faulty gene and one that works normally.
If both parents carry the faulty gene, there's a 25% chance that each child they have will be born with cystic fibrosis.
Read more about the causes of cystic fibrosis.
Most cases of cystic fibrosis are now detected soon after birth through the newborn blood spot test.
This involves collecting a drop of blood from the baby's heel and testing it for abnormalities that could indicate cystic fibrosis.
More tests will be needed to confirm the diagnosis, such as:
These tests can also be carried out in older children and adults with symptoms of cystic fibrosis who haven't been screened previously.
If you have a family history of cystic fibrosis, you can be tested to determine if you're at risk of having a child with the condition by checking if you're a "carrier" of the faulty gene that causes it.
Read more about how cystic fibrosis is diagnosed.
There's currently no cure for cystic fibrosis, but a number of treatments are available to help control the symptoms, prevent complications, and make the condition easier to live with.
Possible treatments include:
A lung transplant may eventually be needed if the lungs become greatly damaged.
Read more about treating cystic fibrosis.
Cystic fibrosis is a progressive condition, which means it tends to get worse over time.
Eventually the condition can be fatal if it leads to a serious infection or the lungs stop working properly.
The outlook for cystic fibrosis has improved considerably in recent years because of advancements in treatment, although most people with cystic fibrosis will have a shorter-than-average life expectancy.
Currently, about half of the people with cystic fibrosis will live past the age of 40. Children born with the condition nowadays are likely to live longer than this.
If you or your child has cystic fibrosis, your clinical team will pass information about you/your child on to the National Congenital Anomaly and Rare Diseases Registration Service (NCARDRS).
This helps scientists look for better ways to prevent and treat this condition. You can opt out of the register at any time.
A genetic disorder is a disorder caused by a fault in the genes. It is usually hereditary (runs in the family).
A carrier is a person or animal that spreads an organism that causes disease but does not become ill themselves.