Some people have hereditary angioedema, a genetic form of water retention where swelling recurs every few weeks. A low level of C1 protein in the blood, which usually regulates functions like the flow of fluid in and out of cells, causes this condition. Triggers include stress and illness. Angioedema can be dangerous depending on where it occurs; the trachea, face, and intestinal tract are common areas that can lead to complications.
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