Swollen eyelids are eyelids that are thicker and more puffy than usual. The swelling is usually caused by fluid building up in the loose connective tissue around the eyes. This tissue can easily retain fluid, making the eyelid look puffy or swollen.
The swelling may occur in one eyelid or both, and may affect the upper or lower eyelid. Sometimes the swelling is accompanied by other symptoms such as redness, itching, pain, watery eyes or a feeling of tightness.
Possible causes
Puffy eyelids can have various causes. Common ones include:
- Allergies: pollen, house dust mites, pets or cosmetics can trigger an allergic reaction, causing itching and swelling.
- Irritation: smoke, wind, chlorinated water or prolonged screen use can irritate the eyes and cause slight swelling.
- Infection: inflammation of the eyelid, the lacrimal gland or the conjunctiva can lead to swelling, redness and, in some cases, pus.
- Fluid build-up: not getting enough sleep, eating too much salt, crying or lying down can cause temporary fluid build-up around the eyes.
- Trauma: a knock, insect bite or other injury can cause the eyelid to swell.
- Underlying conditions: sometimes persistent or severe swelling may indicate an eye condition or a general health problem.
When is it important to have it checked?
Mild, temporary swelling after a bad night’s sleep or after crying is usually harmless. Swelling that lasts longer, is accompanied by pain, a fever, a change in your vision, or where the eye itself is red and irritated, requires assessment by your optician, optometrist or ophthalmologist.