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- Capillary: Small blood vessels connecting arteries and veins.
- Claudication: A symptom caused by lack of blood flow to the muscles caused by narrowing of the arteries. The symptom of claudication usually occurs in the calf or in an arm, and is an aching pain that resolves with rest.
- Clinical trial: A research study to answer specific questions about new therapies or new ways of using known treatments. Clinical trials are used to determine whether new drugs or treatments are both safe and effective.
- Conjunctivitis: Inflammation of the most superficial layer of the eye, characterized by redness and often accompanied by a discharge. Conjunctivitis can be caused by certain infections, but is also associated with some types of vasculitis.
- Cryoglobulins: Protein complexes circulating in the blood that are precipitated by cold.
- Cutaneous: Relating to the skin.
- Cytokine: Group of chemicals that signal cells to perform certain actions.
- Cytoplasmic: The protoplasm outside the nucleus of a cell.
