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Club foot
Clostridium difficile (klos-TRID-e-um dif-uh-SEEL), also known as Clostridioides difficile and often referred to as Cdifficile or C. diff, is a bacterium that can cause symptoms ranging from diarrhea to life-threatening inflammation of the colon.
Clostridium difficile
Inflammation of the colon caused by the bacteria Clostridium difficile.
Clostridium difficile colitis results from disruption of normal, healthy bacteria in the colon, often as a result of antibiotics. C. difficile can also be transmitted from person to person by spores. It can cause severe damage to the colon and even be fatal.
Symptoms include diarrhoea, stomach pain and fever.
Treatment includes antibiotics. Even when treated with antibiotics, the infection may come back. In rare cases, faecal transplant or surgery may be needed.
Clinical depression
A mental health disorder characterised by persistently depressed mood or loss of interest in activities, causing significant impairment in daily life.
Possible causes include a combination of biological, psychological and social sources of distress. Increasingly, research suggests that these factors may cause changes in brain function, including altered activity of certain neural circuits in the brain.
Cleft lip and palate

Cleft lip and cleft palate are openings or splits in the upper lip, the roof of the mouth (palate) or both. Cleft lip and cleft palate result when facial structures that are developing in an unborn baby don't close completely.

Cleft lip and cleft palate are among the most common birth defects. They most commonly occur as isolated birth defects but are also associated with many inherited genetic conditions or syndromes.

Claustrophobia
Claustrophobia is a situational phobia triggered by an irrational and intense fear of tight or crowded spaces. It can be triggered by things like being locked in a windowless room, being stuck in a crowded elevator, or driving on a congested highway. Claustrophobia is one of the most common phobias.
CJD
Creutzfeldt-Jakob disease (CJD) is a rare, degenerative, fatal brain disorder. It affects about one person in every one million per year worldwide; in the United States there are about 350 cases per year. CJD usually appears in later life and runs a rapid course.