充血

1. Origins, structure, and basic meaning

• Structure: 充血 (じゅうけつ) combines filling 充 and blood 血 to denote congestion or bloodshot redness.
• Basic usage: It describes a reddened eye seen in a mirror or depicted with red lines in art.

2. Common pitfalls and similar expressions

• Bloodshot congestion versus bleeding
  • 目が充血する means vessels are engorged and visible; it does not mean blood is flowing out of the eye.