Swelling

Swelling (edema) is a condition involving the excessive accumulation of fluid in the interstitial space of tissues, leading to a visible increase in the volume of a specific body area. This phenomenon can be local or generalized and constitutes a symptom rather than a distinct disease entity. Edema results from an imbalance between the processes of fluid filtration and resorption in the capillaries and the lymphatic system. It can have an inflammatory, vascular, lymphatic, hormonal, or traumatic basis, and its nature and location often provide important diagnostic information.

Swelling – causes

The pathomechanism of edema formation is complex and involves several basic physiological mechanisms, such as an increase in hydrostatic pressure, a decrease in plasma oncotic pressure, increased vascular permeability, and impaired lymph drainage.

The most common causes of swelling include:

Inflammatory states – lead to the dilation of blood vessels and increased permeability, allowing fluids and inflammatory cells to penetrate into the tissues.
Venous circulation disorders – chronic venous insufficiency causes blood stasis and increased pressure in the vessels, which promotes the formation of edema, especially in the lower limbs.
Lymphatic disorders – impaired lymph drainage (e.g., in the course of lymphedema) leads to the accumulation of protein-rich fluid.
Systemic diseases:
- heart failure,
- kidney diseases (e.g., nephrotic syndrome),
- liver diseases (hypoalbuminemia).
Hormonal factors – sodium and water retention, e.g., in the course of hormonal disorders or during the premenstrual period.
Mechanical injuries – tissue damage leads to localized post-traumatic edema.
Allergic reactions – rapid swelling (e.g., angioedema) resulting from the release of inflammatory mediators.

Understanding the cause of edema is crucial for implementing appropriate therapeutic management.

Swelling – most common location

The location of swelling often indicates its etiology and can be an important diagnostic element.

Edema is most commonly observed in the following areas:

Lower limbs (calves, ankles, feet)

Typical for venous insufficiency, heart disease, or prolonged immobilization. These swellings intensify during the day.

Around the eyes (eyelids)

Often associated with water retention, kidney diseases, or allergic reactions. Swelling is usually more visible in the morning.

Face

May have an inflammatory (e.g., infections), allergic origin, or be the result of lymphatic disorders.

Abdomen (ascites)

Occurs mainly in the course of liver diseases and advanced heart failure.

Upper limbs

Often associated with lymphatic drainage disorders, e.g., after surgical procedures (mastectomy).

Characteristic features of the edema (e.g., whether it leaves a pit after pressure – so-called pitting edema) help in differentiating its causes.

Swelling – is it dangerous?

The clinical significance of swelling depends on its cause, the dynamics of its onset, and accompanying symptoms. In many cases, edema is mild and transient; however, it can also be a symptom of serious conditions.

Particular attention should be paid to:

sudden, unilateral limb swelling – may indicate deep vein thrombosis,
swelling of the face and airways – characteristic of an anaphylactic reaction, a life-threatening condition,
generalized edema (anasarca) – may indicate heart, kidney, or liver failure,
swelling accompanied by pain, redness, and increased skin temperature – suggests inflammation or infection.

Chronic swelling can lead to secondary complications, such as tissue fibrosis, trophic skin disorders, or an increased risk of infection (e.g., erysipelas).

Swelling – how to treat

Therapeutic management of swelling depends directly on its etiology and should be causally oriented.

Basic treatment methods include:

General treatment

Pharmacotherapy:
- diuretics in the case of generalized edema,
- anti-inflammatory drugs,
- drugs improving venous tone (phlebotonics).
Lifestyle modification:
- reduction of salt intake,
- regular physical activity,
- avoiding staying in one position for a long time.

Physical and procedural treatment

In modern medicine, methods supporting the reduction of edema by improving microcirculation and lymphatic drainage are used:

manual lymphatic drainage – a massage technique supporting lymph flow,
pressotherapy (pneumatic drainage) – controlled pressure supporting lymphatic and venous circulation,
carboxytherapy – improvement of microcirculation and tissue oxygenation through the administration of CO₂,
radiofrequency therapies (e.g., INDIBA) – stimulation of cellular metabolism and improvement of circulation,
body shaping and fluid stagnation reduction treatments.

In the case of lymphedema, complex decongestive therapy (CDT) is used, including drainage, compression therapy, and skin care.

Swelling – ointments and antibiotics

Topical treatment is mainly used in the case of inflammatory, post-traumatic, or venous edema. Externally applied preparations may support the reduction of symptoms, but they do not eliminate the cause of the edema.

Most commonly used groups of preparations:

Anti-edematous ointments and gels:
- containing heparin – antithrombotic and anti-edematous effect,
- with escin or troxerutin – improvement of vascular tone and reduction of permeability,
- cooling preparations – reduction of pain and the feeling of heaviness.
Anti-inflammatory preparations (NSAIDs)

Applied topically to reduce inflammation and pain.

Antibiotics

Indicated only in the case of a confirmed bacterial infection (e.g., cellulitis, erysipelas). Therapy should be conducted under medical supervision.

In clinical practice, it is important to distinguish whether the swelling requires only symptomatic treatment or constitutes a manifestation of a disease requiring diagnostics and causal treatment.