What causes red bloodshot eyes?
Generally, redness in the eyes may be caused by excessive fatigue, medication side effects, conjunctivitis, keratitis, or Sjögren's syndrome. It is recommended to seek medical attention promptly to determine the underlying cause and receive appropriate treatment. Specific causes are analyzed as follows:
1. Excessive Fatigue
Prolonged use of electronic devices, reading, or working can lead to eye strain, causing blood vessels in the eyes to dilate and resulting in redness. This may be accompanied by symptoms such as dryness, eye discomfort, and blurred vision. It is advisable to rest adequately, avoid prolonged eye use, and take breaks every hour by gazing into the distance or closing the eyes.
2. Medication Side Effects
Certain medications, such as antihistamines (e.g., terfenadine tablets), may cause dilation of blood vessels in the eyes, leading to redness and itching. It is recommended to consult a doctor promptly to adjust the dosage or switch to an alternative medication.
3. Conjunctivitis
This condition may be caused by bacterial or viral infections, resulting in dilated and congested eye blood vessels, along with symptoms such as eye pain, itching, and increased discharge. Under medical guidance, treatments may include chloramphenicol eye drops, ganciclovir eye drops, or ofloxacin eye drops.
4. Keratitis
Typically caused by infections from bacteria, viruses, or fungi, keratitis leads to corneal inflammation and congestion, causing symptoms including redness, photophobia, tearing, and decreased vision. Treatment under medical supervision may involve tobramycin eye drops, levofloxacin eye drops, or acyclovir eye drops.
5. Sjögren's Syndrome
This may result from infections or hormonal imbalances. Chronic dryness can lead to ocular complications, manifesting as redness and dry eyes. Under a doctor’s guidance, medications such as methotrexate tablets, cyclophosphamide tablets, or azathioprine tablets may be used for treatment.
Maintaining healthy lifestyle habits is important, such as going to bed early and waking up early, aiming to sleep before 11 p.m. each night, avoiding staying up late, and ensuring sufficient sleep.