Blepharitis is one of the most common eye conditions I see in clinic. Most people who have it have never been given the diagnosis. Here I explain what it is, why it happens, and how to manage it properly.
Try the watery eyes toolBlepharitis is chronic inflammation of the eyelid margins, the thin strip of skin at the edge of each eyelid where the lashes emerge. It can affect one or both eyes, and it can range from a mild nuisance to something that significantly affects quality of life. What makes it unusual among eye conditions is how common it is and how rarely it is named. In clinic, it is exceptionally common to find it in people who have never been given the diagnosis and have been living with its symptoms for years.
Blepharitis is not a disease in the way that an infection is a disease. It is a chronic inflammatory state driven largely by what happens in the glands along the eyelid margin. Once it is established, it does not tend to resolve on its own. But with the right routine, it is very manageable, and most people see significant improvement.
Blepharitis is chronic, meaning it does not have a defined beginning and end. It is managed, not cured. The most important thing to understand before starting treatment is that the routine needs to become a daily habit, not something done until symptoms improve and then stopped.
There are two main forms. Anterior blepharitis affects the front of the eyelid, around the base of the lashes, and is often associated with a bacterial overgrowth or with scalp dandruff (seborrhoeic dermatitis). Posterior blepharitis affects the inner edge of the lid and involves the meibomian glands, the oil-secreting glands that run along the inside of each lid margin. This form, also called meibomian gland dysfunction or MGD, is by far the more common of the two, and it is the form most people have when they first present with symptoms.
There are roughly 25 meibomian glands in each eyelid, running in a single row along the inside of the lid margin. Their function is specific: they secrete a thin film of oil that sits on top of the aqueous (watery) component of the tear film. This oil layer is not decorative. It is structural. It slows down evaporation of the tears and keeps the tear film stable between blinks.
When these glands become blocked or inflamed, the oil they produce thickens and becomes less fluid. Instead of flowing freely onto the tear surface, it stagnates within the gland. The oil layer on the tear film becomes thin and unstable. The tears begin to evaporate more rapidly than they should.
What happens next is counterintuitive. As the tear surface dries out, even briefly, even slightly, the eye sends a distress signal to the lacrimal gland. The lacrimal gland responds with a flood of watery reflex tears, far more than the eye needs. The result is an eye that waters persistently: running in the wind, streaming when you step outside in the cold, producing enough tears to be genuinely inconvenient.
This is why dry eye causes watery eyes. And it is why blepharitis, by disrupting the oil layer that prevents evaporation, is one of the most common underlying causes of the symptom most people describe simply as “watery eyes.” The two things are not opposites. They are the same process seen from different angles.
The symptoms of blepharitis tend to be persistent and variable rather than acute and dramatic. They are often worse first thing in the morning and in certain environments, wind, air conditioning, low humidity. People commonly describe them as vague and difficult to pin down, which is part of why the diagnosis is so often missed.
Common symptoms include a burning, gritty, or stinging sensation in the eyes that fluctuates through the day; redness along the eyelid margins; crusting or scaling around the base of the lashes, particularly after sleep; and eyes that water more than they should, especially outdoors. Some people notice that their eyes feel more sensitive to light, or that their vision fluctuates slightly, briefly blurring and then clearing when they blink, because the tear film is unstable.
People with blepharitis are also more prone to styes and chalazia, blocked or infected eyelid glands that produce swellings at the lid margin. These are not the same as blepharitis, but they arise from the same underlying gland dysfunction.
The burning, gritty feeling of blepharitis is frequently mistaken for tiredness, screen fatigue, or allergies. These can contribute, but they do not cause the persistent lid-margin changes that blepharitis produces. If symptoms have been present for months and are not clearly tied to a seasonal pattern, blepharitis is worth considering.
There is no single treatment that eliminates blepharitis. What works, and what the evidence supports, is a daily routine that addresses the underlying gland dysfunction directly. The routine has two components: heat and cleaning.
Applying sustained warmth to the closed eyelids softens the thickened oil inside the meibomian glands and helps it flow freely again. A warm flannel works, but it cools quickly. Heated eye masks, the kind you microwave for a specified time, maintain temperature better and tend to be more effective. The compress should be warm rather than hot and held in place for at least five minutes. This needs to be done daily to see results.
After the warm compress, gentle cleaning of the eyelid margins removes the debris and thickened secretions that accumulate at the base of the lashes. Purpose-made lid wipes are convenient and well-tolerated. Diluted baby shampoo on a cotton bud is an alternative, though the commercial wipes tend to cause less irritation. The cleaning should be along the lash line itself, not a general face wash, and should be done to both upper and lower lids.
Lubricating drops used regularly alongside the above routine help stabilise the tear film and reduce the dryness that blepharitis causes. Drops with an oil or lipid component (sometimes labelled “lipid-based” or “emollient”) are generally more effective than simple aqueous drops for meibomian gland dysfunction, because they supplement the deficient oil layer rather than simply adding water.
People improve, stop the routine, and find the symptoms return within a few weeks. Blepharitis requires ongoing management. The routine is not a course of treatment with a defined end point, it is a daily habit, in the same way that brushing teeth is a daily habit. This is not the message most people want to hear, but it is the honest one. Consistent management produces consistent results. Intermittent management produces variable results.
If you recognise the symptoms described here, the persistent burning, the morning crusting, the watery eyes that run in the wind, starting a warm compress and lid hygiene routine is a reasonable first step. Most people notice meaningful improvement within a few weeks of doing it consistently.
If symptoms are severe, if you have developed a stye or chalazion, or if self-management has not helped after a consistent month-long trial, an assessment by an ophthalmologist or optometrist is the right next step. At the consultation, the lid margins and glands can be examined directly, and targeted treatments, including prescription antibiotic or anti-inflammatory preparations, can be considered if needed.
If watery eyes are your main complaint, it is also worth reading the full explanation of why eyes water, which covers the full range of causes and how they are assessed.
Blepharitis is chronic inflammation of the eyelid margins, particularly affecting the meibomian glands that produce the oily component of the tear film. It is one of the most common eye conditions, frequently undiagnosed, and produces symptoms including burning, grittiness, morning crusting, and watery eyes. It is a long-term condition that requires ongoing management rather than a single course of treatment.
Not in the way that an infection can be cured. Blepharitis is a chronic condition that is managed rather than eliminated. With a daily routine of warm compresses and lid hygiene, most people see significant and sustained improvement. The most common reason treatment does not work is stopping the routine once symptoms improve, which almost always leads to symptoms returning.
Yes, and this is one of the most commonly missed connections. When the meibomian glands are blocked, the oily layer of the tear film breaks down and tears evaporate too quickly. The eye responds with a flood of reflex watering. Blepharitis is one of the most frequent underlying causes of the symptom patients describe as “my eyes are always running.”
Blepharitis is a chronic, generalised inflammation of the eyelid margins. A stye is an acute, localised infection of a single gland, producing a painful red swelling. A chalazion is a blocked gland that produces a firm, painless lump. People with blepharitis are more prone to both, because the underlying gland dysfunction creates the conditions in which they develop. They are related but distinct conditions.
Most people notice some improvement within two to four weeks of starting a consistent routine. Full improvement can take six to eight weeks. The routine needs to be daily to produce meaningful results, doing it twice a week is unlikely to be enough. If there is no improvement after a consistent four to six week trial, an assessment is appropriate.
No. Blepharitis is not infectious and cannot be passed from person to person. While bacteria play a role in some forms, it is not an infection in the way that conjunctivitis can be. It does not require isolation or special precautions around others.
