Hydrotherapy for Lymphedema: Water Therapy to Reduce Swelling and Improve Drainage

Lymphedema is a chronic condition caused by impaired lymphatic drainage, resulting in persistent swelling — most commonly in the arms or legs. It affects an estimated 250 million people worldwide and is particularly common after cancer treatment involving lymph node removal or radiation. Unlike ordinary oedema, lymphedema involves protein-rich fluid that, if left unmanaged, leads to tissue fibrosis, recurrent infections, and progressive limb enlargement. Water provides one of the most effective environments for lymphedema management because hydrostatic pressure naturally compresses tissues and assists lymphatic drainage, while buoyancy enables exercise that would be difficult or impossible with a heavy, swollen limb on land.

Why Water Works for Lymphedema

The aquatic environment addresses lymphedema through several complementary mechanisms that work simultaneously during immersion.

• Hydrostatic pressure acts as natural compression — This is the primary mechanism. When you immerse a limb in water, the water exerts pressure on the tissues from all directions. This pressure increases with depth — deeper immersion means greater pressure. The effect is similar to wearing a compression garment, but the pressure is applied uniformly and increases gradually rather than requiring careful fitting. A 2014 review in the North American Journal of Medical Sciences confirmed that hydrostatic pressure during water immersion produces measurable reductions in tissue swelling and assists fluid return to the central circulation [1].
• Enhanced lymphatic drainage — The combination of hydrostatic pressure, movement, and deep breathing during aquatic exercise stimulates the lymphatic system. Unlike the cardiovascular system, the lymphatic system has no central pump — it relies on muscle contractions, breathing, and external pressure to move fluid. Water provides all three simultaneously: muscles contract against resistance, deep breathing creates pressure changes in the thorax, and hydrostatic pressure pushes fluid centrally.
• Buoyancy supports the swollen limb — A limb with lymphedema can be significantly heavier than normal, making land-based exercise exhausting and uncomfortable. In water, buoyancy supports the limb, allowing free movement, exercise, and elevation that would be difficult on land. This is particularly important for arm lymphedema, where the affected arm can move through its full range with buoyancy assistance.
• Exercise without overload — Exercise is a cornerstone of lymphedema management — it stimulates lymphatic flow through muscle contractions. However, excessive or high-impact exercise can worsen lymphedema by increasing blood flow faster than the impaired lymphatic system can handle. Water provides a controlled exercise environment where intensity is self-regulating: move faster for more resistance, slower for less. The risk of overloading the lymphatic system is lower in water than on land.
• Skin cooling — Lymphedematous skin is prone to infection (cellulitis), and heat can exacerbate swelling. Pool water (typically 28-33°C) is cooler than body temperature, providing gentle cooling that reduces inflammation and is comfortable for the affected limb.
• Improved circulation — Warm water vasodilation increases blood flow, while hydrostatic pressure improves venous return. This combined effect reduces the venous hypertension that often accompanies and worsens lymphedema, particularly in the legs [1].

What the Research Shows

Aquatic therapy for lymphedema has a growing evidence base, particularly for breast cancer-related lymphedema (BCRL).

A systematic review published in Supportive Care in Cancer examined the effects of aquatic exercise on breast cancer-related lymphedema. The review found that aquatic exercise programmes reduced arm volume, improved arm function, and enhanced quality of life in women with BCRL. Importantly, aquatic exercise did not worsen lymphedema — a key safety concern — and in most studies actually reduced swelling [2].

A randomised controlled trial by Tidhar and Katz-Leurer (2010) in the Journal of Lymphoedema compared aquatic lymphatic therapy (a structured water-based programme) with standard decongestive therapy. The aquatic group showed significant reductions in limb volume comparable to conventional treatment, with higher patient satisfaction and adherence rates.

The Mooventhan and Nivethitha (2014) review documented that water immersion at 32°C produces significant cardiovascular changes including a 15% reduction in heart rate and 11-12% reduction in blood pressure, reflecting improved venous return and cardiac efficiency [1]. For lymphedema, this improved venous dynamics reduces the venous component of limb swelling.

The 2023 meta-analysis of 32 randomised controlled trials in the Journal of Orthopaedic Surgery and Research confirmed that aquatic exercise significantly improves physical function and reduces pain in chronic conditions, supporting its broader application for lymphedema management [3].

Research specifically examining the effect of hydrostatic pressure on lymphatic flow has shown that immersion to neck depth increases central blood volume by approximately 700ml as fluid is redistributed from the periphery — demonstrating the powerful decongestive effect of water immersion.

Hydrotherapy Exercises for Lymphedema

These exercises should be performed in a pool at 28-33°C. The water should be comfortably warm but not hot — excessive heat can worsen lymphedema. Immerse the affected limb as deeply as possible to maximise hydrostatic pressure. Always wear your compression garment in the pool unless your lymphedema therapist advises otherwise (some programmes recommend exercising without compression in water, as the water itself provides compression).

Warm-Up: Deep Breathing (3-5 minutes)

• Diaphragmatic breathing — Stand in chest-deep water. Place one hand on your chest and one on your abdomen. Breathe deeply into your abdomen, expanding against the water pressure. Exhale slowly and completely. The hydrostatic pressure on your chest provides natural resistance for the diaphragm, and each deep breath creates pressure changes in the thorax that pump the thoracic duct — the main lymphatic collection vessel. 10 deep breaths.
• Shoulder rolls — Roll shoulders forward and backward slowly. This activates the muscles around the lymph nodes in the neck, armpits, and collarbone area — the major lymphatic clearance zones. 10 rolls each direction.

For Arm Lymphedema

• Arm sweeps — With the affected arm fully submerged, sweep it forward to shoulder height, then out to the side, then back. Water resistance provides gentle muscle contractions that pump lymphatic fluid, while buoyancy supports the heavy limb. 3 sets of 10 each direction.
• Underwater arm circles — Circle the affected arm in large, slow circles forward and backward. 10 circles each direction. The circular movement provides continuous muscle activation and fluid mobilisation.
• Fist pump — With the arm submerged, make a tight fist, hold 3 seconds, then open the hand fully. 20 repetitions. This rhythmic muscle contraction acts as a pump for lymphatic fluid in the forearm and hand.
• Wrist curls and rotations — Curl the wrist up and down, then rotate clockwise and counter-clockwise. 10 repetitions each movement. Targets the distal lymphatic vessels in the hand and wrist.
• Bilateral arm exercises — Push both arms forward through the water, then pull back. Sweep sideways. Perform symmetrical movements that encourage drainage from the affected arm through collateral pathways to the unaffected side. 3 sets of 10.

For Leg Lymphedema

• Water walking — Walk forward, backward, and sideways in chest-deep water. The combination of hydrostatic pressure on the legs, rhythmic muscle contractions, and deep breathing during sustained walking creates optimal conditions for lymphatic drainage. 10-15 minutes.
• Marching in place — Lift knees alternately toward the chest while standing in chest-deep water. The calf and thigh muscle contractions pump lymphatic fluid upward, while the deep water provides maximum hydrostatic pressure on the legs. 3 sets of 20.
• Heel raises — Rise up on toes, hold 3 seconds, lower slowly. 3 sets of 15. The calf muscle is one of the most powerful lymphatic pumps in the body — each contraction squeezes lymphatic vessels and pushes fluid upward.
• Ankle pumps — Stand or sit on the pool steps. Point toes down, then pull toes up toward shin. 30 repetitions. Rapid ankle pumping activates the calf muscle pump efficiently.
• Leg swings — Hold the pool wall. Swing the affected leg forward and backward, then side to side. 15 swings each direction. The rhythmic movement mobilises fluid in the thigh and hip.
• Deep-water cycling — Use a buoyancy belt or noodle in deep water. Pedal with a cycling motion. This provides sustained, rhythmic lower limb muscle activation with maximum hydrostatic pressure on the legs. 10-15 minutes.

Swimming

• Freestyle or backstroke — Swimming laps provides rhythmic, bilateral muscle activation, cardiovascular conditioning, and deep breathing — all beneficial for lymphatic drainage. Even 10-15 minutes of gentle swimming provides meaningful decongestive benefit.
• Kickboard work — For leg lymphedema, flutter kicking with a kickboard provides sustained lower limb muscle activation. For arm lymphedema, pulling with arms while legs rest on a float provides sustained upper limb activation.

Cool-Down (5 minutes)

• Slow walking — Walk slowly for 2-3 minutes, allowing heart rate to normalise while maintaining gentle lymphatic pumping.
• Final deep breathing — 10 deep diaphragmatic breaths in chest-deep water. Maximises thoracic duct pumping at the end of the session.
• Gentle self-massage in water — While standing in the pool, gently stroke the affected limb from distal (hand/foot) to proximal (shoulder/hip) using long, smooth strokes. This mimics manual lymphatic drainage technique and encourages fluid movement toward the lymph nodes. 2-3 minutes.

Lymphedema Types and Water Therapy Approaches

Breast Cancer-Related Lymphedema (Arm)

The most studied form of lymphedema in aquatic therapy research. Pool exercise is safe and does not worsen arm lymphedema — this has been conclusively demonstrated. Focus on arm exercises in chest-deep water for maximum hydrostatic pressure. Swimming is excellent. Avoid very hot water, which can increase swelling. Many oncology physiotherapists now incorporate aquatic therapy as a standard component of BCRL management.

Primary Lymphedema (Congenital)

Present from birth or developing during puberty due to lymphatic system malformation. Aquatic exercise provides lifelong management benefits. Start early — children with primary lymphedema benefit from regular swimming and pool activities that combine fun with therapeutic exercise. Consistency over decades is the key to preventing progressive worsening.

Secondary Lymphedema (Post-Surgical, Post-Radiation)

Following lymph node removal or radiation damage to lymphatic vessels. Aquatic therapy can begin once surgical wounds are healed and the oncology team gives clearance. The hydrostatic pressure of water provides an external compression effect that partially compensates for the lost lymphatic capacity.

Lower Limb Lymphedema

Water therapy is particularly effective for leg lymphedema because standing in deep water places maximum hydrostatic pressure on the legs — the area most affected. The pressure gradient (greater at the feet, less at the surface) mirrors the gradient design of compression stockings, naturally encouraging fluid movement upward.

Home-Based Water Therapy for Lymphedema

• Arm lymphedema: basin exercises — Fill a deep basin or sink with cool-to-warm water (28-33°C). Immerse the affected arm and perform fist pumps, wrist circles, and finger exercises. The hydrostatic pressure provides compression while the exercises stimulate drainage. 10-15 minutes, twice daily.
• Leg lymphedema: cool baths — A cool-to-lukewarm bath (28-33°C, not hot) provides full-body hydrostatic pressure. Perform ankle pumps, leg lifts, and cycling motions while soaking. Avoid hot baths — heat can worsen lymphedema. 15-20 minutes.
• Swimming at a community pool — Regular swimming (2-3 times per week) is one of the most effective ongoing management strategies for lymphedema. The combination of hydrostatic pressure, rhythmic exercise, and deep breathing provides comprehensive lymphatic stimulation. Many lymphedema therapists consider swimming the single best exercise for their patients.
• Cool water immersion — Brief immersion of the affected limb in cool water (15-20°C for 5-10 minutes) can reduce swelling and inflammation. Cool water constricts blood vessels, reducing the blood flow that contributes to lymphatic overload. Particularly helpful after a long day on your feet or after exercise.
• Home swim spa — For people managing chronic lymphedema, a home swim spa or plunge pool provides daily access to aquatic therapy. The consistency of daily water exercise produces better long-term outcomes than occasional sessions.

When to Avoid Hydrotherapy for Lymphedema

• Active cellulitis or lymphangitis — If the lymphedematous limb is infected (red, hot, painful, with possible red streaking), do not enter a pool. Infections must be treated with antibiotics before resuming aquatic therapy. Pool chemicals can irritate infected skin, and the infection could spread to others.
• Open wounds or skin breakdown — Lymphedematous skin is fragile and prone to breakdown. Wait until any wounds, ulcers, or weeping areas are fully healed.
• Active cancer treatment — During chemotherapy or radiation, consult your oncology team before pool use. Immune suppression during treatment increases infection risk. Some treatments also affect skin integrity.
• Hot water — Avoid water above 33°C for lymphedema exercise. Hot water causes vasodilation, which increases blood flow to the affected area faster than the impaired lymphatic system can handle, potentially worsening swelling.
• Deep vein thrombosis — If DVT is suspected or confirmed, do not exercise until cleared by your medical team.

Frequently Asked Questions

Is swimming good for lymphedema?

Swimming is one of the best exercises for lymphedema. It provides simultaneous hydrostatic compression, rhythmic muscle activation, deep breathing, and cardiovascular conditioning — all of which stimulate lymphatic drainage. Research has shown that swimming does not worsen lymphedema and often reduces limb volume. Many lymphedema therapists consider regular swimming the single most effective ongoing management strategy. Swim at a comfortable pace in cool-to-warm water (28-33°C).

Should I wear my compression garment in the pool?

Practice varies. Some lymphedema therapists recommend wearing compression in the pool, while others note that the water itself provides sufficient compression. Ask your lymphedema therapist for their recommendation based on your specific case. If you do wear compression in the pool, rinse the garment thoroughly after each session to remove chlorine, and consider using a dedicated “pool garment” to preserve your everyday garment.

Can hydrotherapy reduce lymphedema swelling?

Yes. Research demonstrates that aquatic exercise reduces limb volume in lymphedema. The hydrostatic pressure of water pushes fluid out of the tissues and back into circulation, while exercise stimulates lymphatic pumping. Some studies show volume reductions comparable to conventional decongestive therapy. The effect is most pronounced during and immediately after immersion, but regular aquatic exercise produces sustained improvements in lymphedema management over time.

How often should someone with lymphedema do aquatic exercise?

For optimal lymphedema management, 2-3 pool sessions per week is recommended. Each session should include 30-45 minutes of exercise in the water. Daily pool access (if available) produces even better results. Between pool sessions, continue wearing compression garments and performing land-based self-management as recommended by your lymphedema therapist. Consistency is the most important factor in long-term lymphedema control.

Related Reading

• 12 Hydrotherapy Exercises for Pain Relief and Recovery
• Contrast Water Therapy: The Science Behind Hot-Cold Alternation
• Warm Water Therapy for Muscle Pain
• Hydrotherapy for Health Conditions A-Z

Always work with a certified lymphedema therapist (CLT) when designing your exercise programme. Lymphedema management requires individualised care. See our Medical Disclaimer.

Sources

[1] Mooventhan, A., & Nivethitha, L. (2014). Scientific Evidence-Based Effects of Hydrotherapy on Various Systems of the Body. North American Journal of Medical Sciences, 6(5), 199-209. https://pmc.ncbi.nlm.nih.gov/articles/PMC4049052/

[2] Yeung, W., & Semciw, A.I. (2018). Aquatic therapy for people with lymphedema: A systematic review and meta-analysis. Supportive Care in Cancer, 26(5), 1459-1467.

[3] Journal of Orthopaedic Surgery and Research (2023). Efficacy of aquatic exercise in chronic musculoskeletal disorders: A meta-analysis of 32 randomized controlled trials.