Edema

What is Edema?

Edema is a buildup of fluid in the spaces between cells that happens when fluid leaks out of the small blood vessels faster than the lymphatic system can drain it.^[1] It is a sign that something else is wrong, and its causes range from minor to life-threatening.^[2]

Common symptoms

Edema shows up as puffy or swollen skin, most often in the feet, ankles and legs, and often a dent that stays after you press on it. Swollen areas can feel tight or heavy.^{[1, 3]} Skin can become shiny or stretched, and shoes or clothing may feel tight.^[4]

Chronic lymphedema is different. The skin tends to look thick or brawny and does not pit as easily, and recurrent skin infections are a risk.^{[1, 4]}

Causes and risk factors

Swelling in both legs that builds up over time often points to venous insufficiency, and quickly developing swelling throughout the body can come from systemic disease such as heart, kidney or liver disease.^[1] Some medicines, including blood pressure drugs, anti-inflammatory drugs and hormones, can also cause it.^[3]

Lymphedema comes from impaired lymph drainage. It can be primary, caused by a lymphatic abnormality, or secondary to surgery, radiation, infection, trauma or cancer.^[4] Sleep apnea can also cause leg swelling.^[1]

How it is diagnosed and treated conventionally

How long the swelling has lasted and whether it affects one leg or both guide the evaluation. A physician may order blood tests, a urine test, liver and thyroid tests and a heart marker, and may use ultrasound.^[3] New swelling in one leg needs prompt evaluation for a blood clot.^[3]

Treatment depends on the cause. Diuretics work but should be used only for systemic causes, and compression therapy helps for most causes.^[3] Skin care matters for preventing breakdown and venous ulcers.^[1]

Why Edema calls for a whole-person approach

Swelling rarely has a single cause. Vein function, lymph drainage, heart, kidney and liver health, medicines, salt intake and how much a person moves can all contribute.^{[2, 3]}

This is why the first step is always a medical evaluation. Supportive care can be added only after the cause is known and being treated.

Veins and circulation

Long-standing swelling in the legs, especially when it is worse by evening, often reflects chronic venous insufficiency, in which veins cannot return blood to the heart well.^{[1, 5]}

The lymphatic system

When lymph drainage is impaired, protein-rich fluid collects in the tissue, and ongoing swelling triggers inflammation and tissue changes over time.^[4]

Organ disease and medicines

Heart, kidney and liver conditions, and several common drugs, can cause or worsen edema, which is why a medication list is part of the work-up.^{[1, 3]}

Movement and skin care

Compression and skin care are central to managing venous and lymphatic swelling, and skin breakdown can lead to ulcers.^{[1, 3]}

Acupuncture as supportive care in Edema

What the research shows

We found no systematic reviews of acupuncture for edema in general, and the best evidence is for arm swelling after breast cancer treatment. A 2019 meta-analysis of 13 trials with 747 patients found a higher effective rate with acupuncture for breast cancer-related lymphedema, but noted that few trials were high quality and outcome measures were inconsistent.^[6]

A 2024 meta-analysis of 14 trials with 952 patients reported smaller arm circumference, better shoulder movement and less pain with acupuncture, and no serious adverse reactions.^[7] A network meta-analysis of 18 studies suggested that warming-needle moxibustion might work best, and also called for larger, higher-quality trials.^[8]

Other reviews are more cautious. A review of treatments for breast cancer-related lymphedema found that exercise, bandaging and pneumatic compression were most effective and that acupuncture did not show conclusive results.^[9] An overview of 51 systematic reviews found only that acupuncture "appeared to have benefit" for lymphedema, based on 3 reviews of 3 trials, and rated most of the reviews as very low quality.^[10] We found no acupuncture reviews for swelling from heart, kidney or venous disease.

How acupuncture may work

No study has shown how acupuncture would reduce edema. Researchers have not established a mechanism for fluid swelling, and the lymphedema studies did not test one.

What treatment involves

Treatment uses fine, sterile, single-use needles at points on the body, usually left in place for about 20 to 40 minutes, with a course of several visits and regular reassessment. Needling near a swollen arm or leg should be discussed with your treating team first.

In prospective studies, about 9 in 100 patients had a minor reaction such as brief bleeding, soreness or bruising, and serious events occurred in about 1 in 10,000.^[11] Tell the practitioner first if you have a bleeding disorder, take blood thinners, are pregnant, have a pacemaker (relevant to electroacupuncture), or have skin infection or open wounds near the swollen area.

Ayurvedic medicine as supportive care in Edema

The Ayurvedic view

In Ayurveda, swelling is described as Shotha. In this traditional framework it is linked to imbalance of the doshas, especially Kapha, with impaired digestion and sluggish movement of fluids. These are traditional categories, not biomedical diagnoses, and they do not replace a medical evaluation of the cause.

Therapies that may be used

Supportive care is individualized and traditionally includes:

• Diet and daily routine, such as lighter meals, less salt and regular movement, which is in line with standard advice
• Gentle massage and local warmth, applied with care
• Herbs traditionally used for swelling, such as punarnava (Boerhavia diffusa), chosen and prescribed individually

Panchakarma and strong sweating or heat therapies are not appropriate for edema from heart, kidney or liver disease, during pregnancy, acute illness or frailty, or with infection, a blood clot or an undiagnosed swollen leg. Heat should be used with care in lymphedema, where repeated skin infections are a known complication and the skin needs protecting.^[4]

What the research shows

We found no randomized trials or systematic reviews of Ayurvedic treatment for edema. The only human data we found are uncontrolled studies of lymphatic filariasis, a tropical infection that causes leg lymphedema. A retrospective review of 1,698 patients treated in India with an integrative program, which combined Ayurveda with yoga, compression, antibiotics and antifungal treatment, reported reduced limb volume and fewer episodes of cellulitis. Because there was no comparison group and Ayurveda was only one part of the program, this cannot show that Ayurveda itself helped, and it may not apply to other causes of swelling.^[12]

A research-priority exercise in lymphedema care listed exploring the evidence for traditional medicine therapies as an unmet need.^[13] We found no study of punarnava for swelling in people, so its effect is unknown.

Herbal medicine as supportive care in Edema

Herbs and formulas that have been studied

Most herbal research on swelling concerns leg edema from chronic venous insufficiency. The plant products studied include horse chestnut seed extract and Ruscus extract.^{[3, 14]} Some of the venoactive products studied in a Cochrane review also come from plants, including Centella asiatica, grape seed and French maritime pine bark.^[5]

What the research shows

Evidence is limited and mostly relates to venous insufficiency. A primary care review states that Ruscus extract and horse chestnut seed show moderate-quality evidence for improving edema from chronic venous insufficiency.^[3] A 1998 review of placebo-controlled trials found that horse chestnut seed extract was associated with smaller lower-leg volume and less leg pain and tiredness, with mild adverse effects.^[14]

A Cochrane review of 69 trials of venoactive products, many not herbal, found that they probably reduce leg swelling slightly compared with placebo, make little or no difference in quality of life, and probably cause slightly more side effects, mostly stomach upset.^[5] We found no herbal trials for lymphedema or for swelling from heart, kidney or liver disease. Herbs are not a substitute for compression or for diuretics when your physician prescribes them.

Safety and herb-drug interactions

Herbs can interact with medicines, and people with edema often take diuretics, blood pressure drugs, blood thinners or heart medicines. Reports describe enhanced bleeding when danshen or ginkgo is combined with warfarin, and other herbs affect drugs for blood pressure and the heart.^[15]

Herbs that act on fluid balance can add to a diuretic's effect, and they can matter for people with kidney disease. About one fifth of Ayurvedic medicines bought online contained detectable lead, mercury or arsenic.^[16] Herbal and dietary supplements account for about 20% of drug-induced liver injury cases in the United States.^[17] Tell us if you have heart, kidney or liver disease, are pregnant or breastfeeding, or are taking any prescription medicine.

Translating traditional medicine into modern biological language

The links here are interpretation, not equivalence. Chinese medicine often describes swelling as dampness or retained fluid linked to weak spleen or kidney function, and Ayurveda describes Shotha as a Kapha-type excess of fluid. Modern medicine describes edema as a balance between capillary filtration and lymphatic drainage, and the traditional ideas loosely overlap with fluid retention, venous or lymphatic congestion and organ function.^{[1, 4]}

No study shows that a dosha or a TCM pattern corresponds to a specific mechanism of edema, and the traditional frameworks do not replace a medical diagnosis.

How this care fits with your medical care

Edema needs a medical evaluation, because the cause may be a heart, kidney, liver, thyroid, vein or lymphatic problem, or a medicine. For a condition like this, we ask that you are under a physician's care for it and that your treating team knows you are receiving complementary care. We do not diagnose the cause of swelling, prescribe or change medicines, or replace your physician.

Do not stop or change diuretics or other prescribed medicines on your own, and do not restrict fluids without your physician's advice. Please bring your diagnosis, a full list of medicines and supplements, recent blood and urine test results, and any heart or vein ultrasound reports. Keep up with compression and skin care as advised.

When to seek urgent medical care

Some swelling is an emergency and needs immediate medical care, not complementary care.^{[1, 3]}

• Sudden swelling, pain or redness in one leg, which can mean a blood clot
• Swelling with shortness of breath, chest pain or trouble breathing when lying flat
• Swelling in the face or lips with trouble breathing or swallowing
• A swollen red, hot, painful area with fever or spreading redness, which can mean infection
• Sudden weight gain with swelling, little urine, confusion or severe headache
• Swelling with vision changes or severe headache during pregnancy

If any of these occur, call 911 or go to the nearest emergency department.