Understanding lymphoedema

Lymphoedema is fluid accumulation from failed lymphatic drainage — usually asymmetrical, and it involves the foot. Lipoedema is a disorder of fat tissue — symmetrical, painful, tender to pressure, and it characteristically spares the foot. The distinction determines the treatment entirely.

Lymphoedema: often one limb, swelling includes the foot or hand, skin pits when pressed in early stages and thickens over time, and there is usually an identifiable cause such as surgery, radiotherapy or infection.

Lipoedema: both limbs symmetrically, painful and tender to pressure, bruises easily, and the swelling stops abruptly at the ankle leaving the foot normal. It affects almost exclusively women and often begins around puberty, pregnancy or menopause.

It is routinely diagnosed as obesity. Women are told to lose weight for years while the condition progresses, and lipoedema fat does not respond to diet the way ordinary fat does — weight loss often reduces the upper body while the legs remain unchanged.

The pain is the feature most often overlooked. Ordinary fat is not tender to pressure and does not bruise easily; lipoedema is and does.

In advanced lipoedema, the lymphatic system can become overwhelmed and secondary lymphoedema develops on top — lipo-lymphoedema. At that point the foot becomes involved and the picture changes.

This is one reason for treating lipoedema rather than watching it: progression to a combined picture is harder to manage than either condition alone.

In lymphoedema, complete decongestive therapy — manual lymphatic drainage, compression bandaging, exercise and skin care — substantially reduces limb volume and, with maintained compression, keeps it reduced. It is controlled rather than cured, and it is lifelong management.

In lipoedema, conservative treatment reduces pain and swelling and slows progression. It does not remove the abnormal fat tissue. Anyone who is told a course of drainage will change limb shape in lipoedema has been misled.

The mechanisms are different, so the treatment emphasis is different, and treating the wrong one wastes months while the condition progresses.

Diagnosis is clinical, supported by ultrasound. It does not require complex investigation — it requires someone examining the foot and asking whether the swelling is tender.

Lymphoedema after cancer treatment cannot be reliably prevented, but risk can be reduced and early detection changes the outcome substantially. Swelling caught in the first months responds far better than swelling that has been present for a year.

Removal of lymph nodes and radiotherapy to a nodal area both reduce lymphatic drainage capacity. The more nodes removed and the more extensive the radiotherapy, the higher the risk. Breast, gynaecological, urological and head and neck cancers, and melanoma, are the common contexts.

Risk does not disappear with time. Lymphoedema can develop months or years after treatment, often triggered by an infection, an injury or a period of unusual load.

A feeling of heaviness or tightness in the limb before any visible swelling. Rings, watches or sleeves becoming tighter. Aching. A subtle difference in how the limb feels rather than how it looks.

Visible swelling is a late sign — measurable volume change happens before it is apparent. This is why baseline measurement before cancer treatment, and periodic measurement afterwards, detects it far earlier than waiting for symptoms.

Exercise. Progressive resistance training in people at risk of, or with, lymphoedema does not worsen it and appears protective — this reverses decades of advice to avoid using the limb. Maintaining a healthy weight also reduces risk meaningfully.

Skin care and prompt treatment of any infection. Cellulitis in an at-risk limb both causes and worsens lymphoedema, and it needs antibiotics quickly rather than watchful waiting.

Long lists of prohibitions — no blood pressure cuffs, no injections, no flying, no lifting on that side, no hot baths — were standard for years and are largely unsupported by evidence. They restricted lives considerably on the basis of theory rather than data.

Current guidance is more permissive and focuses on skin care, weight and exercise. If you have been given a long list of prohibitions, it is worth asking whether it reflects current evidence.

Lymphoedema treated early, when it is still soft and fluid-based, responds well and often reduces to near-normal. Once tissue changes have set in — fibrosis and fatty deposition over months and years — volume reduction is much harder and less complete.

This is why new heaviness in the arm after surgery is worth reporting rather than waiting to see if it settles.