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Uveitis-glaucoma-hyphema syndrome is a rare complication after intraocular lens (IOL) implantation.The cause of the disease is the mechanical friction of the intraocular lens on the anterior segment structures.There is no unified consensus on the pathogenesis of UGH syndrome, and it is generally accepted that disruption of the blood-aqueous humor barrier and reverse pupillary block are the two common mechanisms.The typical clinical manifestations of UGH syndrome include anterior chamber inflammation, increased intraocular pressure and hyphema, with or without vitreous hemorrhage.It is easily misdiagnosed as uveitis.If untreated, it can lead to serious consequences such as loss of vision.The diagnosis of UGH syndrome is based on IOL implantation history, slit-lamp microscopy examination (especially after pupil dilation) that observes an IOL deviation or absence of the capsule, and an ultrasound biomicroscopy that observes contact between IOL and the iris or ciliary body.Treatment for UGH syndrome includes drugs, lasers, and surgery.At present, surgery is the primary method, mainly including IOL alignment, IOL removal or replacement, capsular tension ring implantation, etc.Laser treatments include laser iridoplasty, laser iridotomy and ciliary body laser photocoagulation.UGH syndrome has been reported more frequently abroad and is only reported as case reports in China.The purpose of this review is to discuss the etiology, pathogenesis and diagnosis of UGH syndrome.In addition, we discuss the treatment and caveats of UGH syndrome.The aim of review is to provide a more comprehensive basis for clinicians to understand, diagnose and treat UGH syndrome.