What causes conjunctival congestion?

Conjunctival congestion usually refers to redness of the eye, primarily caused by inflammation, infection, or other irritants leading to capillary dilation and increased blood flow in the conjunctiva. Eye conditions such as conjunctivitis, keratitis, and scleritis can all cause conjunctival congestion, often accompanied by symptoms like redness, swelling, pain, and itching. In addition, unhealthy lifestyle habits—such as chronic sleep deprivation and excessive eye strain—may also contribute to conjunctival congestion. If symptoms of eye redness occur, it is recommended to seek medical attention promptly.