How is conjunctivitis caused?

Written by Peng Xi Feng

Ophthalmology

Updated on March 14, 2025

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Conjunctivitis is one of the most common diseases in ophthalmology. The causes can be divided into microbial and non-microbial categories, and based on different sources, they can be categorized as exogenous or endogenous. It may also be caused by the spread of inflammation from adjacent tissues, with the most common cause being microbial infections. The pathogens can be bacteria or chlamydia, with occasional fungal, Rickettsia, and parasitic infections.

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Written by Peng Xi Feng

Ophthalmology

35sec

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Does conjunctivitis require isolation?

Infectious conjunctivitis can lead to epidemic infection, therefore it is essential to take preventive measures. Conjunctivitis is often spread through contact, thus it is advocated to frequently wash hands and faces, and avoid wiping eyes with hands or sleeves. Patients with infectious conjunctivitis must be isolated, and any toiletries used by the patients must be isolated and disinfected. Medical staff should also wash and disinfect their hands after examining patients to prevent cross-infection.

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Written by Tao Yuan

Ophthalmology

58sec

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Can acute conjunctivitis cause facial swelling?

Acute conjunctivitis can possibly cause swelling of the eyelids and the face. Acute conjunctivitis is a common ophthalmic disease, usually caused by neglecting eye hygiene. For example, rubbing your eyes with dirty hands, washing your face with unclean water, and wiping your eyes with contaminated towels, tissues, or wet wipes can transfer viruses, bacteria, and other pathogens from the environment into the eyes, thereby causing infection and conjunctivitis. Inflammatory stimulation can cause reactive swelling of the skin adjacent to the eye. Conjunctivitis needs timely treatment with anti-infective eye drops to eliminate symptoms. For instance, bacterial infections can be treated with eye drops such as Levofloxacin Hydrochloride and Fusidic Acid, while viral infections can be treated with Ganciclovir and Acyclovir eye drops. (Please follow medical advice when using medications.)

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Written by Peng Xi Feng

Ophthalmology

37sec

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Should people with conjunctivitis avoid certain foods?

Patients with conjunctivitis should avoid spicy foods, such as onions, leeks, garlic, chili peppers, lamb, dog meat, and other heat-inducing comfort foods, which are not conducive to the early recovery of the disease. Additionally, they should consume less shrimp, crab, and other seafood that may exacerbate the condition. Smoking is also prohibited due to the presence of nicotine in cigarettes, which constricts blood vessels and can worsen red eye, thus smoking must be strictly avoided. Furthermore, alcohol consumption should be avoided as it can prolong the disease.

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Written by Li Zhen Dong

Ophthalmology

57sec

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How to distinguish between viral conjunctivitis and allergic conjunctivitis?

Allergic conjunctivitis mainly presents with itching and conjunctival edema, generally without obvious secretions. Viral conjunctivitis usually has watery secretions and lacks significant itching. In terms of treatment, viral conjunctivitis is primarily treated with antiviral medications, such as aciclovir eye drops and ganciclovir eye drops. The treatment for allergic conjunctivitis mainly involves steroid eye drops and non-steroidal eye drops, and also requires the use of anti-inflammatory eye drops. Neither type of conjunctivitis should be treated with warm compresses. For allergic conjunctivitis, it is also important to avoid allergens, while for viral conjunctivitis, it is crucial to be aware of any visual impairments. (Note: The use of medications should be carried out under the guidance of a professional doctor.)

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Written by Peng Xi Feng

Ophthalmology

31sec

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How is conjunctivitis caused?

Conjunctivitis is one of the most common diseases in ophthalmology. The causes can be divided into microbial and non-microbial categories, and based on different sources, they can be categorized as exogenous or endogenous. It may also be caused by the spread of inflammation from adjacent tissues, with the most common cause being microbial infections. The pathogens can be bacteria or chlamydia, with occasional fungal, Rickettsia, and parasitic infections.