Understanding Eye Flu: Symptoms, Causes, Treatment, and Prevention

Originally Medically Reviewed by Dr. Sony Sherpa, (MBBS) - July 29, 2024

Fact Checked and Updated by Dr. Rae Osborn, Ph.D. - June 12, 2026

Introduction

Eye flu refers to any common viral eye infection that causes conjunctivitis (pink eye). Seasonal outbreaks of eye flu are common worldwide. While usually not difficult to treat, in severe cases, eye flu can lead to vision problems if not treated on time. Knowing eye flu symptoms and treatment options can help you to identify and resolve the problem swiftly.

In this article, we will explore eye flu in detail, shedding light on signs and symptoms, types, causes, treatment, and prevention. Home remedies for eye flu and specific medications are also covered to aid with recovery.

What Is Eye Flu?

Eye flu is a viral infection that causes inflammation of the conjunctiva, the thin membrane that covers the white area of the eye and the inner surface of the eyelids, and is medically referred to as viral conjunctivitis. This condition is often colloquially referred to as pink eye due to the characteristic pink or red appearance of the affected eye.

Eye Flu vs. Conjunctivitis

While eye “flu" is often used interchangeably with "conjunctivitis," conjunctivitis is not caused by the flu virus. The four main causes of conjunctivitis include viruses, bacteria, allergens, and irritants. Eye flu most often refers to viral conjunctivitis, although it can easily be confused with the other types as well.

Out of all types of conjunctivitis, viral conjunctivitis is the most common type, constituting between 75-80% of all cases. The prevalence of eye flu changes depending on the season, region, occupation, age, and gender.

What Are the Types and Causes of Eye Flu?

There are many types of eye infections that can lead to eye flu. Adenovirus is the number one cause of eye flu, accounting for up to 90% of all cases. It is also responsible for respiratory and gastrointestinal infections, which may occur before or after the appearance of viral pink eye. Herpes simplex virus and enterovirus make up most other cases of viral conjunctivitis. There have also been reports of eye flu attributed to COVID-19, influenza A and B, measles, and rubella.

Acute Hemorrhagic Conjunctivitis is a rare, highly contagious disease that causes the eyes to bleed alongside intense swelling and all other common symptoms of eye flu. This is believed to be caused by picornaviruses EV70 and coxsackievirus A24v and warrants specialized medical attention.

Highly contagious, viral conjunctivitis is caused by direct contact with an infected individual. It is best to avoid touching your eyes if you come down with eye flu or regular flu to avoid cross-contamination between the eyes and the body and exacerbate viral symptoms. Surfaces can also become contaminated with viral fragments, making it important to practice good hygiene and take preventive measures. While wearing contact lenses is associated more with bacterial infections, it can also worsen symptoms if you already have viral eye flu.

How to tell the difference between an eye infection and the flu

Eye pain from the flu is a common complaint. Many individuals struggle to discern between an eye infection and the flu. Here is how you can tell the difference:

An Eye Infection is usually localized to just the eyes, yet may occasionally involve the nose and ears. It may also be caused by bacteria, in which case it will look completely different from the pink eye caused by the flu. That said, it is important to note that diagnosis typically involves culture testing rather than relying solely on visible signs.

In Influenza, the eyes may become infected as they are a common entry point for the virus. Eye pain occurs with influenza A. In general, if you have pink eyes alongside other flu-like symptoms, such as a cough, sore throat, fever, and aching joints, then you are probably fighting off a variant of influenza. A cold can also easily be confused for viral conjunctivitis, yet the symptoms fall somewhere between an eye infection and the flu. Adenoviruses can also mimic flu features.

Other Causes of Conjunctivitis

Eye flu can easily be confused with other types of conjunctivitis, such as bacterial conjunctivitis and allergic conjunctivitis. By knowing the signs and symptoms of eye flu, you can discern which type is causing your pink eye and seek appropriate treatment.

Note: As the symptoms of eye flu can overlap with those of bacterial conjunctivitis, allergic conjunctivitis, influenza-related eye symptoms, and other eye conditions, it may not always be possible to determine the cause based on symptoms alone. A healthcare professional can perform an appropriate evaluation, recommend additional testing when necessary, and help ensure that more serious eye conditions are not overlooked. 

What Are the Signs & Symptoms of Eye Flu?

Recognizing the symptoms of eye flu is crucial for timely intervention and management. Common eye flu symptoms include:

• Red or pink appearance of the eye: This is a common symptom due to the inflammation of blood vessels in the conjunctiva, giving the eye a characteristic red or pink color.
• Watery eyes or excessive tearing/discharge: The eyes may produce more tears than usual or have a watery discharge as the body's response to the viral infection.
• Itching and irritation in the eye: Affected individuals often experience persistent itchiness or a gritty sensation in the eyes, making it difficult to avoid rubbing them.
• Eye discharge, clear or colored: The discharge in viral conjunctivitis is clear and watery. A secondary bacterial infection of the eye can lead to a purulent discharge.
• Swollen eyelids: The inflammation can lead to noticeable swelling of the eyelids, sometimes making it difficult to open the eyes fully.
• Pain or pressure in the eyes: Some people may feel mild to moderate pain or a sense of pressure in the affected eye, particularly when blinking or moving the eye.
• Blurry vision: This can occur due to inflammation and discharge, leading to temporary vision impairment.
• Light sensitivity: Patients may experience discomfort or pain when exposed to bright lights.

Eye flu frequently starts in one eye and swiftly spreads to the other eye. If caused by an adenovirus, it is possible for it to spread to the lymph glands. This can lead to a swollen throat, gastrointestinal symptoms, fevers, cough, and other flu-like symptoms.

Not all individuals experience eye pain with eye flu. If you have pink eyes with symptoms not listed above, you might have an eyelid infection or a different type of conjunctivitis. If you are not sure what type of eye flu you have, it is best to seek medical help to treat your condition.

How can you tell whether an eye infection is bacterial, allergic, or viral?

Eye flu is sometimes confused with bacterial or allergic conjunctivitis, which can seem similar. The difference between them is obvious when comparing their symptoms. Symptoms of non-viral conjunctivitis are briefly reviewed below:

• Bacterial Conjunctivitis

Bacterial Conjunctivitis is frequently caused by bacteria such as Staphylococcus aureus, Streptococcus pneumoniae, and Haemophilus influenzae. Symptoms that differentiate bacterial conjunctivitis from viral conjunctivitis include a thicker, yellow, or green discharge and crusty or sticky eyes. This type can result from poor hygiene or contact with contaminated people and objects. It is rare for bacterial conjunctivitis to display symptoms of a cold or flu, as seen in the viral type.

• Allergic Conjunctivitis

Allergens like pet dander, dust mites, or pollen cause allergic conjunctivitis. It leads to similar symptoms to those of viral conjunctivitis, such as pink eyes, eye-watering, and sometimes a runny nose or sneezing, yet it is not contagious. Allergic conjunctivitis will often also occur in both eyes at once instead of starting in one eye and spreading to the other, and the eyes will be very itchy.

Why does the eye hurt when you have eye flu?

Eye pain during eye flu comes from the inflamed and irritated conjunctiva, the thin layer covering the white part of the eye and the inside of the eyelids. This inflammation can cause discomfort, a sensation of grittiness, and pain, especially when blinking or moving the eyes.

How long does eye flu last?

It is not currently possible to cure an eye infection in 24 hours. Eye flu recovery time depends on the type of infection and the state of your immune system. For the most common type, viral pink eye, the average recovery time is thought to be 7 to 14 days. This is also the most contagious window for those with viral conjunctivitis.

Left untreated, the infection may become systemic, though this is more likely if it is caused by bacteria. If you are coughing, sneezing, or have a sore throat, you are probably still contagious. It is best to avoid working around other people or engaging in social activities until the worst symptoms have worn off.

What Are the Treatment Options for Eye Flu?

There are no definitive treatment options for viral eye flu aside from resting, supporting your immune system, and relieving symptoms, although some treatments are being evaluated in trials. Viral infections usually go away on their own within a week or two, yet the process may be quicker if the infection is kept contained to just the eyes.

The section below covers self-care practices, eye flu medicines, and natural remedies for treating eye flu at home. If the condition does not improve within a few days, it is important to see a doctor.

Conjunctivitis Self-Care

If you have viral conjunctivitis, self-care and hygiene can help keep the virus contained, aid in eye flu recovery, and alleviate unpleasant symptoms. Some tips for managing eye flu include:

• Applying damp, warm compresses to the eyes to help soothe irritation.
• Using artificial tears to help moisten the eyes and also alleviate irritation.
• Avoid rubbing the eyes to prevent symptoms from worsening or potential complications.
• Maintaining good hygiene, washing hands frequently, and cleaning personal items regularly, including towels and linen.

Natural Remedies for Treating Eye Infections at Home

There are no specific remedies known to cure eye flu in one day. It might be helpful to understand that many nutrient-rich foods and supplements contain substances that can improve your immunity when fighting a viral eye infection. Some nutrients, such as zinc, can help with seasonal conjunctivitis. Nutrients can possibly prevent viruses, like adenovirus, from binding to cells and reinfecting the area. They also lower inflammation, which supports the immune system in managing the infection.

Antiviral Foods

Herbs, spices, and teas such as mint, basil, ginger, garlic, chamomile, green tea, and black tea are renowned for possessing an abundance of these antiviral compounds, as well as citrus fruits like lemon. Drinking beverages containing these may lessen irritability symptoms and assist in preventing the infection from spreading to other parts of the body.

Herbal Warm Compress

You could also try using a warm tea bag over the eyes in place of a warm compress, provided you have clean hands, and wash the area well after. That said, since non-sterile organic materials may increase the risk of irritation, allergy, or secondary infection, many clinicians recommend using only a clean compress with plain water around the eyes.

Salt Water Rinse

If you do not have eye drops to help cleanse your eyes, you could use commercially prepared sterile saline rinses for added safety. Homemade saline is not sterile and should be avoided, as it can cause an infection.

OTC Medication for Eye Flu

Over-the-counter medicines for eye flu may help reduce symptom severity. A few useful suggestions include:

Eye Drops (Artificial Tears)

Eye drops or artificial tears contain a clear saline solution that can flush out the eyes. They have proven efficacy as eye flu medicine, and can help cleanse the eyes and alleviate irritation and discomfort. This is also an effective option for other types of conjunctivitis caused by allergies or irritants.

Vitamin C Supplement

Vitamin C has a wide range of actions that could be helpful for dealing with eye flu. It can help lower inflammation, improve immunity, and directly inhibit several common bacterial and viral strains known to cause eye infections. However, current clinical evidence remains limited, and vitamin C should not be considered a proven treatment or replacement for standard medical care for viral conjunctivitis.

Pain Relief

Some sources recommend using painkillers such as non-steroidal anti-inflammatories for pink eye pain. These may help lower eye pain and alleviate other symptoms, yet some studies associate them with an increased risk of eye problems, which might also depend on the route (topical vs. systemic).

Prescription Medications

If your eyes are not responding to self-care or other remedies for dealing with a viral infection, then you might be suffering from a bacterial eye infection and require prescription antibiotics. A physician can aid in identifying the infection's primary cause and the best course of action for treatment.

Off-Label Antivirals

While there are no approved antivirals that can help treat viral conjunctivitis, doctors may prescribe off-label antivirals in cases of conjunctivitis caused by herpes simplex virus, but these are not useful for conjunctivitis caused by adenovirus. Most cases of viral conjunctivitis are self-limiting and don’t need treatment, but research into antiviral therapies is ongoing and may be helpful for immunocompromised individuals or those with severe illness.

Preventive Measures

Preventing eye flu requires avoiding exposure to carriers (people and objects), as well as practicing good hygiene. You can minimize the risk of catching an eye infection by:

• Washing your hands frequently with soap and water.
• Not touching your face too often or without cleaning your hands beforehand.
• Regularly disinfecting surfaces and objects that are used often, including doorknobs, light switches, and electronic devices.
• Do not go swimming
• Ensuring shared items are properly cleaned before use, such as keyboards or phones.
• Not sharing personal items, like towels, cosmetics, or contact lenses.
• Avoid close contact with people who have pink eye or flu-like symptoms.
• Staying away from overly crowded areas.
• Being aware of hand hygiene after touching public surfaces, such as benches, rails, and doors.

Complications

Severe infections can lead to corneal ulcers, which can result in vision problems that may require surgical correction if not treated promptly. Rarely, an eye infection may cause systemic sickness by migrating to other body systems.

While eye flu is generally self-limiting and resolves without significant complications, there can be exceptions. One such potential complication is uveitis. Uveitis is inflammation in the eye's middle layer. Severe viral infections, like viral conjunctivitis, can sometimes lead to uveitis.

When to Seek Medical Help

While most cases resolve without complications, eye flu can be dangerous if severe enough and left untreated for too long. It is essential to seek medical assistance if you experience the following:

• Severe pain in the eyes
• A sudden change in vision
• The eyes become redder
• Symptoms worsen or persist despite treatment
• The infection does not improve after a few days of self-care and over-the-counter treatments

Conclusion

Eye flu is a common viral malady that causes conjunctivitis and is known to affect millions of people globally every year. Understanding eye flu can go a long way toward improving recovery and reducing the risk of recurrent infections and long-term visual complications. There are no approved medicines for eye flu, and treatment includes self-care measures and remedies to support immune function. Prioritizing hand hygiene, avoiding close contact with infected individuals, and maintaining a clean environment are key measures to lower the likelihood of catching and transmitting eye flu.

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First Published: September 03, 2023

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