What causes red bloodshot eyes?
May 21, 2024
Source: Cainiu Health
Dr. Wang Shuai
Introduction
Redness in the eyes may be caused by lack of sleep, environmental factors, scleritis, uveitis, glaucoma, and other conditions. To prevent redness, it is important to maintain adequate sleep, avoid prolonged eye strain, and wear protective eyewear when outdoors. If redness persists or is accompanied by discomfort, the underlying cause should be identified and addressed promptly. Maintaining a healthy daily routine and taking proper protective measures can help preserve eye health.
Generally, red blood vessels in the eyes may be caused by factors such as lack of sleep, environmental irritants, scleritis, uveitis, or glaucoma. When discomfort occurs, follow medical advice for appropriate treatment. Specific causes are analyzed below:
1. Lack of Sleep
Lack of sleep is usually caused by irregular daily routines, staying up late, or high work pressure. The eyes do not get sufficient rest, leading to eye muscle fatigue and dilation of blood vessels, resulting in redness. In addition to red blood vessels, symptoms such as eye fatigue, dryness, and blurred vision may also occur. This condition typically does not require special treatment; improving sleep habits and ensuring adequate sleep duration is sufficient.
2. Environmental Factors
Microscopic particles in the air—such as dust, hair, and pollen—as well as ultraviolet radiation, wind, and sand can irritate the eyes, causing blood vessel dilation and redness. This may be accompanied by itching, a foreign body sensation, or tearing. It is advisable to minimize direct exposure to these environmental factors and wear protective eyewear or goggles when outdoors.
3. Scleritis
Scleritis is commonly caused by infections, autoimmune diseases, or metabolic disorders. These conditions lead to inflammation of the scleral tissue, causing blood vessel dilation and visible redness in the eye. Additional symptoms may include eye pain, decreased vision, and tenderness upon eye movement. Treatment should follow medical guidance and may include medications such as tobramycin-dexamethasone ophthalmic solution, flumethasone ophthalmic solution, or pranoprofen ophthalmic solution.
4. Uveitis
Uveitis is typically triggered by endogenous or exogenous factors such as infection, autoimmune disease, metabolic disorders, or trauma. These factors cause inflammation of the uveal tissue, leading to eye redness and blood vessel dilation. Symptoms often include eye pain, photophobia, tearing, and vision loss. Treatment under medical supervision may involve medications such as dexamethasone tablets, diclofenac sodium eye drops, or cyclosporine capsules.
5. Glaucoma
Glaucoma is a serious eye condition that may be related to genetic factors or abnormalities in the eye's internal structure. It leads to elevated intraocular pressure, causing blood vessel dilation and congestion, which manifests as red blood vessels on the eye surface. Other symptoms may include eye pain, eye redness, blurred vision, nausea, vomiting, and headaches. Follow medical advice for treatment with medications such as acetazolamide tablets, carteolol hydrochloride eye drops, or latanoprost eye drops.
To prevent and improve redness in the eyes, maintain good sleep habits and wear protective eyewear or goggles when outdoors. If persistent redness or other discomfort occurs, promptly identify the underlying cause and take appropriate preventive measures.
