Eye redness may appear suddenly or gradually increase over a few days. Some people experience redness only, with no accompanying symptoms. However, others experience significant discomfort and irritation. If the redness in a bloodshot eye does not improve, or if you have intense pain, irritation or a decrease in vision, contact an eye doctor to determine the cause and treatment for the condition.
Allergies
Eye allergies commonly cause the white of the eye to appear red. Other symptoms may also occur with the redness, such as swelling, itching and watering, according to The University of Michigan Kellogg Eye Center. For many people, eye allergies frequently result from pollens or other natural allergens. However, some people may experience eye allergies after contact with pet dander.
To relieve redness and other symptoms, you could use an over-the-counter oral allergy medication, found in most pharmacies. Allergy eyedrops, also found in nonprescription strengths, may also help relieve redness, as well as itching and watering. If over-the-counter versions of oral or eyedrop allergy medications do not work, you may require a prescription from an eye doctor.
Infection
An eye infection, such as conjunctivitis, may cause the eyes to appear red or bloodshot. Conjunctivitis, also referred to as pinkeye, may result from bacteria or from a virus, like the common cold, states MayoClinic.com. Antibiotic eyedrops treat infections caused by bacteria. According to MayoClinic.com, there is no treatment with a viral infection, though severe cases may require a steroid eyedrop to reduce the risk of complications with the cornea, which is the outer window of the eye. For most people, the eye infection will gradually disappear over time, without treatment.
A person should avoid rubbing her eyes to eliminate the possibility of infecting others, as well as reducing the risk of further irritation to the eye and increasing redness.
Injury
Injuries to the eye, even minor injuries, may cause the eye to appear bloodshot. For example, corneal abrasions may result from a scratch on the cornea, often caused from a small foreign body. If this occurs, the eye may turn red and feel painful and vision may blur, explains MedlinePlus. In such cases, particularly if a foreign body may still be in the eye, contact an eye doctor for an evaluation. In most cases, as the scratch or abraded area heals, the redness and irritation will improve.
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