Sudden congestion of one eye may be due to eye trauma, local inflammation, increased intraocular pressure, etc. Different causes of treatment methods are different, patients can follow the doctor’s instructions to use physical therapy, medication and other ways of treatment. When the eyes are hit by external force and other trauma, conjunctival congestion, eyelid swelling and other discomfort symptoms, patients can do early local cold compresses to relieve eye discomfort. Forty-eight hours after the trauma, patients can apply localized hot compresses on the eyes to promote the swelling of the eyes to subside and relieve eye discomfort. If the patient’s body immunity is low, easy to be infected by bacteria or viruses, causing conjunctivitis, keratitis and other eye inflammation, which can lead to conjunctival congestion, the patient can use levofloxacin eye drops, tobramycin eye drops and other medications under the guidance of the doctor, to control the inflammation, to relieve the discomfort of the eye. Glaucoma patients with increased intraocular pressure can lead to eye congestion, this time under the guidance of the doctor, the use of intraocular pressure-lowering drugs such as brinzolamide eye drops, etc., to control intraocular pressure, relieve eye discomfort. It is recommended that patients with significant eye congestion consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.