Blood in the corners of the eyes mostly refers to conjunctival congestion, which is common in visual fatigue, conjunctivitis, dry eye and so on. 1. Visual fatigue: Staying up late or using too much eyes can cause visual fatigue, and patients may experience conjunctival congestion, dry eyes and other uncomfortable symptoms. 2. Conjunctivitis: Conjunctivitis includes allergic conjunctivitis, bacterial conjunctivitis, viral conjunctivitis, etc. Under the stimulation of inflammation, the patient may have conjunctival congestion, and may also have itchy eyes, pain and other uncomfortable symptoms. 3. Dry eye: patients with dry eye caused by insufficient tear secretion or excessive tear evaporation due to a variety of reasons can experience dry eyes, foreign body sensation, conjunctival congestion and other uncomfortable symptoms. It is recommended that patients with obvious eye congestion should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.