Cystic Fibrosis Cf

Overview

Cystic fibrosis (CF) is an inherited condition that makes mucus (the slippery fluid your body makes) thicker and stickier than normal. This thick mucus can clog airways in the lungs and block tubes in organs like the pancreas (an organ that helps digest food). CF is a lifelong condition, but modern care helps many people live longer, fuller lives.

CF is uncommon. It affects about 1 in every 2,500 to 3,000 babies born in some populations, and rates vary around the world.

CF can affect anyone. It is most often found in people of Northern European ancestry, but it occurs in all ethnic groups. It is usually diagnosed in babies or young children, though some people are diagnosed as adults.

Symptoms

Common symptoms

• Ongoing cough, thick mucus, wheezing, or repeated chest infections.
• Greasy or bulky stools, poor weight gain, belly pain, or gas.
• Salty skin or very salty sweat.
• Tiredness or low energy.
• Stuffy nose, nasal polyps (small growths inside the nose), or sinus problems.

Symptoms in children

• Slow growth or failure to gain weight even with a good appetite.
• Frequent lung infections, cough, or wheezing.
• Salty-tasting skin when kissed.
• Greasy, smelly stools or constipation.
• A blocked bowel in a newborn (meconium ileus), which needs urgent care.
• Delayed puberty in some children.

Symptoms in older adults

• More long-term lung damage and more frequent infections.
• CF-related diabetes (high blood sugar caused by CF).
• Bone thinning (osteoporosis) and joint pain.
• Liver problems or fertility challenges.
• Some people are diagnosed in adulthood, often after repeated infections or digestive problems.

Causes

Main causes

• CF is caused by changes (mutations) in the CFTR gene. This gene helps control salt and water movement in cells. When it does not work well, mucus becomes thick and sticky.
• It is inherited in an autosomal recessive pattern. This means a child must inherit one changed CFTR gene from each parent. Parents can be carriers without having CF.

Risk factors

• Family history of CF.
• Parents who are both carriers of a CFTR gene change.
• Certain ancestry, such as Northern European, but CF can affect any ethnic group.
• Having a sibling with CF.

When to see a doctor

See a doctor urgently if:

• New or worsening trouble breathing, chest pain, or a cough that brings up more mucus or blood.
• Fever or signs of a chest infection.
• Severe belly pain, vomiting, or no bowel movement.
• Poor weight gain or weight loss, especially in a child.
• Any newborn who has not passed stool in the first 24 to 48 hours or has a swollen belly.

Book a routine appointment if:

• Ongoing cough, wheezing, or repeated chest infections.
• Greasy, bulky stools or poor growth.
• Salty skin or a family history of CF.
• Planning a pregnancy and wanting to know about carrier status.

Diagnosis

Doctors diagnose CF using a combination of newborn screening, sweat tests, genetic tests, and symptom checks. In the UK and many countries, newborns are offered a screening test (heel prick) that can raise the possibility of CF.

Tests that may be done

• Newborn screening blood test.
• Sweat test: measures salt in sweat. A high result is a key sign of CF.
• Genetic test: looks for changes in the CFTR gene.
• Stool tests to check digestion and pancreatic function.
• Chest X-ray or lung function tests to check the lungs.
• Blood tests to check blood sugar, liver, and vitamins.

What to expect at your appointment

Diagnosis may take a few visits. A specialist CF team will explain results, check your child's growth and lungs, and start a care plan. If you are an adult being tested, your doctor will talk with you about each step.

Treatment

CF care is lifelong and works best with a specialist team. The goal is to keep lungs clear, help digestion, prevent infections, and support growth and daily life. Treatment is adjusted as needs change.

Self-care at home

• Follow your airway clearance plan every day. This may include exercises, devices, or chest physiotherapy to loosen mucus.
• Take all medicines exactly as your CF team advises. Do not change or stop them on your own.
• Keep hands clean and avoid smoke, vaping, and places with lots of germs.
• Stay active and drink enough fluids.
• Keep regular appointments and vaccinations up to date.
• Track symptoms, weight, and how medicines are working, and share changes with your team.

Medical treatments

Treatment may include airway clearance therapy, inhaled medicines to thin mucus or open airways, enzyme replacement to help digest food, vitamins and extra calories, and medicines to fight or prevent infections. Some people use devices or breathing treatments. A specialist team may also recommend lung function checks, nutrition support, and mental health support. Treatment plans are personal and should be set by your CF team.

When is surgery considered?

Surgery is not needed for everyone. It may be considered for problems like nasal polyps, severe bowel blockage, or in some cases lung transplant when lung disease is advanced. Your specialist team will discuss benefits and risks.

Living with this condition

CF adds daily tasks, but many people build routines that fit school, work, and family life. A clear plan for medicines, airway clearance, appointments, and infection prevention can help.

Lifestyle tips

• Keep a regular sleep schedule and rest when needed.
• Wash hands often and avoid close contact with people who are sick.
• Do not smoke or vape, and avoid secondhand smoke.
• Stay physically active within your limits.
• Plan travel with extra medicines and a copy of your care plan.
• Ask about workplace or school support if CF affects attendance.

Diet and exercise

Good nutrition is a big part of CF care. Many people need extra calories, protein, salt (especially in hot weather or with exercise), and vitamins. A dietitian can help. Exercise helps clear mucus and build strength. Choose activities you enjoy and ask your team what is safe for you.

Mental health and emotional wellbeing

CF can bring stress, worry, or sadness, and it can affect body image and relationships. These feelings are common and treatable. Talk with your CF team or a counselor. If you or someone you care for has thoughts of self-harm, call your local emergency number or a crisis service right away.

Prevention

CF cannot be prevented after a child is conceived because it is caused by genes. If you have a family history of CF or are planning a pregnancy, you can ask about genetic counseling and carrier testing. Carrier testing can show whether you and your partner are at higher chance of having a child with CF.

Vaccines

Keep recommended vaccinations up to date, including flu and other vaccines your CF team advises. Vaccines help lower the risk of serious infections.

Screening programmes

Newborn screening is offered in many countries, including the UK, and can find CF early. If there is a family history, genetic counseling and carrier testing can be discussed before pregnancy.

Complications

If left untreated

• More frequent and severe lung infections.
• Permanent lung damage and breathing problems.
• Poor growth and malnutrition because the body cannot digest food well.
• Bowel blockage, liver problems, or CF-related diabetes.
• Bone thinning and fertility challenges.

Long-term outlook

The outlook for people with CF has improved a lot with modern care. Many children with CF now grow up, go to school or work, and build families. Early treatment, regular checkups, and a strong support team can help people live longer and healthier lives. Everyone's path is different, and your CF team can talk with you about what to expect.

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