Swelling under one eye is a common concern that can appear as puffiness, mild inflammation, or noticeable fullness beneath a single eye while the other remains normal. The skin around the eyes is thin and sensitive, making it more prone to fluid retention, allergies, sinus pressure, irritation, or minor infections. In many cases, one-sided under-eye swelling is temporary and improves with rest or gentle care. However, persistent, painful, or worsening swelling may indicate an underlying issue that requires medical attention.
If swelling becomes severe, painful, or is accompanied by redness, vision changes, or fever, visit our Crosby emergency room.
Swelling under a single eye usually develops due to localized issues affecting the tissues, skin, or structures around that eye rather than systemic conditions. Because fluid drainage, sinuses, and skin sensitivity differ on each side of the face, swelling may appear under only one eye.
Even minor trauma around the eye can trigger inflammation and fluid buildup. This may include bumps, scratches, insect bites, or pressure during sleep. Injury-related swelling is often accompanied by tenderness, mild pain, bruising, or warmth and typically becomes noticeable within 24 hours before gradually improving.
Persistent or worsening swelling, especially from infections, should prompt evaluation at an emergency room near me.
Infections are a common cause of swelling under one eye and may require medical attention:
Conjunctivitis (Pink Eye) – Can cause redness, discharge, irritation, and swelling, often starting in one eye.
Styes or Chalazions – Blocked oil glands in the eyelid may form tender lumps, leading to localized swelling.
Sinus Infections – Blocked sinuses on one side of the face can cause pressure and swelling beneath the eye, often with facial pain or congestion.
If swelling worsens, becomes painful, or spreads, evaluation at an emergency room near me may be necessary to rule out deeper infection.
The thin skin under the eyes is highly sensitive, making it prone to irritation from environmental or cosmetic triggers. Swelling under one eye may occur when only that eye is affected. Common triggers include:
Contact with allergens such as pollen, dust, or pet dander
Reactions to makeup, skincare products, or cleansers
Fragrance, alcohol-based products, or expired cosmetics
Allergic or irritant-related swelling is often accompanied by itching, redness, dryness, or burning and usually improves once the trigger is removed.
Fluid can accumulate unevenly under the eyes, particularly after sleeping in one position for long periods. Lying on one side, dehydration, or consuming salty foods before bed may cause fluid to settle under one eye more than the other. This swelling is typically painless and reduces as the day progresses.
Even without an infection, sinus inflammation or blockage can interfere with fluid drainage on one side of the face. This may lead to swelling beneath one eye along with mild facial pressure or headache.
Most cases of under-eye swelling are mild and improve with rest or gentle care. However, certain warning signs indicate that professional evaluation is necessary to prevent complications and ensure proper treatment. Being aware of these symptoms can help you act quickly when needed.
Sudden, severe, or rapidly worsening swelling: Swelling that appears quickly or intensifies may signal an underlying issue.
Pain, tenderness, or warmth around the eye: These symptoms could indicate infection or inflammation requiring medical attention.
Redness, discharge, or pus: Suggests a possible bacterial or viral infection that needs prompt treatment.
Vision changes, such as blurred or double vision: Any impact on vision should be evaluated immediately by a specialist.
Swelling spreading to the cheek, eyelid, or other areas of the face: Expanding swelling can indicate a more serious condition needing urgent care.
If you notice persistent or unusual swelling under one eye, it’s important to address it promptly. Early attention can prevent complications, reduce discomfort, and protect your vision. Don’t ignore warning signs seeking timely care ensures proper treatment and peace of mind.
MBTpg
