Find out about carbon monoxide poisoning, what the symptoms are, what to do if you have it, what causes it, how it is treated, and how to prevent it.
Find out about cardiomyopathy, a general term for diseases of the heart muscle, where the walls of the heart chambers have become stretched, thickened or stiff.
Find out what cardiovascular disease (CVD) is, what problems it can cause, why it happens and how you can reduce your risk.
Find out about catarrh, including what the symptoms are, what you can do to help ease it, when to get medical help, and treatments that may be recommended.
Find out what a cavernoma is, what symptoms it can cause, the importance of closely monitoring symptoms, how it's diagnosed and treatment options.
Find out about Clostridium difficile (C. diff), including what the symptoms are, who's most at risk and how it's treated.
Find out what a carcinoembryonic antigen (CEA) test is, why it's used and when it's carried out.
NHS information about Charles Bonnet syndrome, including symptoms, causes and treatments.
Read about chest infections, including the symptoms, what you can do to treat it yourself, and how a pharmacist and GP can help. A chest infection will usually get better on its own in about 7 to 10 days.
Find out what could be causing your chest pain and if you need to go to hospital or see a GP.
Find out what a Chiari malformation is, what problems it may cause, why it happens and how it can be treated.
NHS information about chilblains, including symptoms, causes and how to treat them yourself.
Find out what chiropractic is, how you can get it on the NHS or privately, and what the treatment involves.
A cholesteatoma is an uncommon abnormal collection of skin cells inside your ear.
Find out about chronic traumatic encephalopathy (CTE), a type of brain condition that slowly gets worse over time and leads to dementia.
Read about circumcision in boys, including why it's carried out, medical reasons for circumcision, what the procedure involves, recovery and risks.
Read about the medical reasons why circumcision in men may be necessary and what happens before, during and after the procedure.
Find out about cluster headaches, which are severe attacks of pain on 1 side of the head, including the symptoms, when to get medical help and how they’re treated.
Find out about colour vision deficiency (colour blindness), what the symptoms are, where to get help, what the tests are, the causes, and the treatments.
Read about what a coma is, how someone in a coma will be looked after, what you can do to help, and what happens when someone recovers from a coma.
Find out what compartment syndrome is, what the symptoms are, and how it's diagnosed and treated.
Find out about costochondritis, including what the symptoms are, what to do if you think you have it, what the treatments are and what causes it.
Read about coughs, including what you can do to ease a cough, help from a pharmacist and when to see a GP.
Read about coughing up blood, including what can cause it and when to get medical help.
Find out about cradle cap, including what the symptoms are and what you can do to help.
Find out more about why CT scans are done and what happens before, during and after the scan.
Find out more about how to treat a cut or graze yourself and when you need to get medical help.
Cyclical vomiting syndrome (CVS) is a rare condition that causes repeated episodes of being sick (vomiting) and feeling sick (nausea).
Find out about cyclospora, including how you get it, where it’s found and what the symptoms are.
Find out why caesarean sections are carried out, whether you can ask for one, what they involve, and what the risks are.
Read about cancer, a condition where cells in a part of the body reproduce uncontrollably. Cancerous cells can invade and destroy surrounding healthy tissue.
A carotid endarterectomy is a surgical procedure to unblock a carotid artery. The carotid arteries are the main blood vessels that supply blood to the brain, face and neck.
Read about carpal tunnel syndrome (CTS), which causes pain and tingling in your hand when there's pressure on a nerve in your wrist. Find out what causes it and how to treat it.
Read about cataract surgery, a procedure to treat cataracts, where changes in the lens of the eye cause cloudy, blurry, or misty vision.
Read about cavernous sinus thrombosis, which is a blood clot in the cavernous sinuses that can be life-threatening.
Cellulitis is a potentially serious infection in the deeper layers of your skin. Find out about the symptoms, causes, treatments and possible complications.
Find out about cerebral palsy, including the symptoms, causes, when to get medical advice, how it's treated and what the outlook is.
Read about cervical cancer, which is found anywhere in the cervix (the opening between the vagina and the womb).
Find out about cervical spondylosis, which is the medical term for neck pain caused by age-related "wear and tear" to bones in the neck area of the spine and the soft cushions of tissue (discs) in the neck.
Charcot-Marie-Tooth disease (CMT) is a group of inherited conditions that cause nerve damage, leading to muscle weakness and numbness
There are different types of chemotherapy medicines, but they all work in a similar way. They stop cancer cells reproducing, which prevents them from growing and spreading in the body.
Chickenpox is a very contagious infection that causes an itchy, spotty rash. Read NHS information about chickenpox symptoms and when to get medical advice.
Find out about childhood cataracts which occur when changes in the lens of a child's eye cause it to become less transparent, resulting in blurred or misty vision.
Chlamydia is one of the most common sexually transmitted infection in the UK. Find out who is most at risk, where to get tested, and how it's treated.
Read about cholera, a potentially fatal bacterial infection caused by consuming contaminated food or water.
Read about why chorionic villus sampling (CVS) is offered during pregnancy, how it's carried out, and what the benefits and risks are.
Find out about chronic lymphocytic leukaemia (CLL), a rare type of blood cancer, including the symptoms and how it's treated.
Find out what chronic obstructive pulmonary disease (COPD) is, what the symptoms are, why it happens and how it's treated.
Chronic pancreatitis is a condition where repeated inflammation permanently damages the pancreas.
Cirrhosis is scarring of the liver caused by long-term liver damage. The scar tissue prevents the liver working properly.
Find out about cleft lip and palate, where a baby is born with a gap in their upper lip and/or the roof of their mouth.
Information about clinical trials and how to join one.
Find out about clubfoot (also called talipes), which is where the foot turns in, and how it's usually easy to treat.
Find out about coeliac disease, an autoimmune disease affecting the digestive system that makes a person have an adverse reaction to gluten.
Find out about colic, including what the symptoms are, what you can do to help soothe your baby, and when to get medical help.
Find out about having a colostomy, including when it's needed, how it's carried out and recovery, plus information and advice about living with a colostomy.
Find out what a colposcopy is, what it is for, what happens on the day and what the results mean.
Find out about the common cold, including what the symptoms are, how it's spread, how it's treated, and how you can prevent it.
Find out about complex regional pain syndrome (CRPS), a poorly understood condition where a person experiences persistent severe and debilitating pain.
Find out about the different types of congenital heart disease, why it happens, the signs and symptoms and how it's treated.
Conjunctivitis is where your eyes are red and sore. Read about what causes conjunctivitis, how to prevent it and how to treat it.
Find out what consent is, how it can be given, when it's needed, as well as situations when it's not needed.
Constipation is common and it affects people of all ages. You can usually treat it at home with simple changes to your diet and lifestyle.
Read about contact dermatitis, a type of eczema that causes inflammation of the skin when you come into contact with a particular substance.
Read about cornea transplants, where surgery is used to remove all or part of a damaged cornea and replace it with healthy cornea tissue from a donor.
NHS information about corns and calluses, including symptoms, causes and how to treat them.
Find out about cardiac catheterisation, an invasive diagnostic procedure that provides important information about the structure and function of the heart.
Find out about coronary angioplasty, a procedure used to widen blocked or narrowed coronary arteries.
Find out why a coronary artery bypass graft (CABG) may be needed, what it involves, how long it takes to recover and the associated risks.
Find out about coronary heart disease (CHD), including the main symptoms, causes, treatments and prevention. CHD is a major cause of death in the UK and worldwide.
Read about corticobasal degeneration (CBD), a rare condition where brain cells become damaged over time and certain sections of the brain start to shrink.
Find out about craniosynostosis, a rare condition where a baby's skull does not grow properly and their head becomes an unusual shape.
Find out about the different types of Creutzfeldt-Jakob disease (CJD), and what causes the condition and how it's treated.
Read more about the symptoms, treatment and complications of Crohn's disease, which is a long-term condition that causes inflammation of the lining of the digestive system.
Find out about croup, including the symptoms, what to do if your child has it, and when to get medical help.
Cushing's syndrome is a collection of symptoms that develop as the result of very high levels of a hormone called cortisol in the body.
Cystic fibrosis is an inherited condition in which the lungs and digestive system can become clogged with thick, sticky mucus. Read about the symptoms, causes and treatments.
Find out more about the bladder infection cystitis, including what the symptoms are, how it's treated and how to prevent it.
Find out more about cytomegalovirus (CMV), a common virus that's usually harmless but can cause problems in babies.
Find out what chronic kidney disease (CKD) is, including what the symptoms are, how it's diagnosed and how it can be treated.
Find out about cold sores, including what the symptoms are, when to get medical help and how to treat them.
Complementary and alternative medicine (CAM) is treatment that falls outside of mainstream healthcare.
Find out how a dentist can treat a chipped, broken or cracked tooth.
Find out what a colonoscopy is, why it's done, what happens on the day and what the results mean.
Read information about cosmetic procedures.
Read the NHS advice about COVID-19, including its symptoms, looking after yourself at home, how to avoid catching and spreading it, treatments, vaccinations and long-term effects.
Find out about the NHS cervical screening programme, including when it's offered, how to book, what happens at your appointment, getting your results and how it can help protect you from cervical cancer.
Find out about chronic myeloid leukaemia (CML), including what the symptoms are, what to do if you think you have it, how it's treated and where to get support.
Find out more about a cystoscopy, which is a test used to look inside the bladder using a tube and a camera, including why it’s done, what happens and what the results mean.
Read about claustrophobia, including common triggers, physical and psychological symptoms, causes and treatment, plus help and support.
Read about counselling, a talking therapy that can help with a range of mental and emotional problems, including stress, anxiety and depression.
Find out about the different methods of contraception, where to get them and how well they work at preventing pregnancy.
Read more about how a contraceptive patch works, how effective it is, how to get and use it and what side effects it may cause.
Find out how to use condoms, also sometimes called external or male condoms, to prevent pregnancy and reduce the risk of sexually transmitted infections (STIs).
Find how the contraceptive implant works, how effective it is, how to get and use it and what side effects it may cause.
Find out about the contraceptive injection, including who can use it, how well it works and possible side effects.
Find out about the combined contraceptive pill, including who can take it and where to get it.
Find out about the chickenpox vaccine, including who can get it on the NHS, how to get it and what the side effects are.
Find out about the children's flu vaccine, including who should have it, how to get it and side effects.