Frequent red bloodshot eyes may be caused by chronic conjunctivitis, allergic conjunctivitis, visual fatigue, dry eye syndrome, and chronic uveitis. Often stay up late and work overtime, lack of sleep, the small blood vessels on the eye surface tend to dilate, which can manifest as increased red blood, which may be related to visual fatigue and dry eye syndrome. It is important to take rest and use anti-fatigue eye drops and artificial tear eye drops for treatment. Patients with chronic conjunctivitis show congestion in the eyes and will also experience increased discharge from the corners of the eyes. After treatment with antibiotic eye drops and eye ointment, they improve, but relapse after various physical and chemical stimuli. In allergic patients, allergic conjunctivitis can flare up if there is frequent contact with allergens, manifesting as visible redness and itching of the eyes. In the elderly, especially those with hypertension and hyperlipidemia, there will be atherosclerosis and changes in vascular elasticity, which manifests itself as a slightly exogenous stimulus forming prolonged red bloodshot eyes.