Facial swelling

Facial swelling means a build-up of fluid or inflammation in the tissues of the face — the cheeks, around the eyes, the lips or the tongue. The cause ranges widely. Localised swelling often reflects a specific problem: a dental abscess or gum infection, a blocked or infected sinus, a salivary gland problem, an insect bite, or injury. A distinct and important pattern is angioedema — a rapid, deeper swelling of the lips, eyelids, tongue or throat. Angioedema is most often allergic, frequently alongside hives (urticaria), triggered by foods, drugs or insect stings; it can also be a side effect of blood-pressure medicines called ACE inhibitors (which can occur even after years of use), or, rarely, an inherited condition (hereditary angioedema, linked to a low complement C4) that causes recurrent swelling without hives. Puffiness of the whole face, especially around the eyes in the morning, can instead reflect fluid retention from kidney, thyroid or other conditions. The crucial judgement is whether swelling threatens the airway.

• Dental or gum infection — a common cause of one-sided facial swelling with tooth pain.
• Sinus infection or blockage — swelling and pressure around the cheeks and eyes.
• Allergic angioedema — rapid swelling of lips, eyelids or tongue, often with hives; from foods, drugs, stings.
• ACE-inhibitor angioedema — a blood-pressure drug side effect, sometimes after long use.
• Hereditary angioedema — rare; recurrent swelling without hives, linked to a low complement C4.
• Insect bite or sting; injury.
• Fluid retention — puffy face/eyelids from kidney, thyroid or other conditions.

Facial swelling is assessed mainly clinically, by its pattern, speed and associated features. Blood tests are targeted rather than routine: for recurrent angioedema without an obvious allergic trigger, a low complement C4 is a key clue to hereditary angioedema, prompting specialist testing; for suspected allergy, total IgE and specific allergy testing may help identify a trigger; and if generalised facial puffiness suggests fluid retention, kidney function, urine protein and thyroid tests are relevant. Mediora.AI can surface a low C4 or an allergic/eosinophilic pattern that fits the picture, but an acute swelling threatening the airway is an emergency needing immediate care, not tests — and recurrent angioedema is assessed by your doctor or an immunologist.