The lymphatic system: how it works, signs that it is sluggish and how to support it

Read first: want to go straight to the technique? Lymphatic massage at home with cupping shows it step by step. What lymphatic massage does and does not do is in What is lymphatic massage? This article explains the system itself.

The lymphatic system is a network of vessels, lymph nodes and lymphatic organs that does three things: returns surplus fluid from the tissue to the blood, absorbs fat from the gut and filters out bacteria, viruses and damaged cells as part of the immune system. Unlike the circulatory system it has no pump of its own; lymph moves thanks to muscle activity, breathing and small valves in the vessels. That is why legs, feet and face swell when we are still for long, and why movement, deep breathing and light massage help. Here is how the system works, which organs belong to it, signs that flow is sluggish, what lymphoedema is and five ways to support the lymph in everyday life.

What is the lymphatic system?

Every day several litres of fluid are pressed out of the smallest blood vessels into the tissue around the cells. Most of it is drawn back into the blood, but around two to three litres remain together with proteins, fat particles, bacteria and cell debris. That fluid is collected by the lymph capillaries, becomes lymph, and is carried through ever larger lymph vessels via the lymph nodes back to the blood in the large veins near the collarbones. On the way the lymph passes hundreds of lymph nodes where immune cells inspect the contents and mount a defence when something foreign appears. That is why the nodes in your neck swell when you have a cold.

The parts of the lymphatic system

• Lymph vessels: a fine network under the skin and deeper in the body, with valves that let lymph pass in one direction only.
• Lymph nodes: 500–700 small filters, grouped in the neck, armpits, groin, behind the knees, in the elbow creases and in the abdomen.
• The spleen: filters the blood, breaks down old red blood cells and stores immune cells.
• The thymus: where T cells mature, mainly active during childhood and adolescence.
• Tonsils and other lymphatic tissue in mucous membranes: the first line of defence in the throat, gut and airways.
• Bone marrow: where lymphocytes (B and T cells) are formed.

The kidneys are not part of the lymphatic system, even though they are often mentioned in the same breath; they clean the blood and regulate fluid balance in their own way.

Three jobs

1. Fluid balance. Without the lymphatic system the tissue would swell within a day. This is the function affected when you stand for long, sit on a flight or are pregnant.
2. Fat absorption. Special lymph vessels in the gut (lacteals) absorb fat and fat-soluble vitamins from food and carry them to the blood.
3. Immune defence. The lymph nodes and lymphatic organs are where the immune system learns to recognise and fight infections.

Why the lymph needs your help

The blood has the heart. The lymph only has the muscle pump (the calf muscles matter most), the pressure changes of breathing in the chest, the pulse of nearby arteries and the weak contractions of the lymph vessel walls themselves. Anything that reduces movement and breathing reduces flow: long days at a desk, standing work, flights, heat, tight clothes, lack of sleep, stress with shallow breathing and a lot of salt. Hormonal changes before menstruation, during pregnancy and in menopause add further fluid to the tissue.

Signs of sluggish lymph flow

• Swollen feet and ankles in the evening, sock marks.
• A puffy face and under-eye bags in the morning.
• Heavy, tired legs, stiffness after sitting.
• A recurring "bloated" feeling in the abdomen, rings that feel tight.
• Cellulite that looks worse in periods (fluid in the subcutaneous layer).

All of this is common and harmless when it comes and goes. Swelling that comes on suddenly, in one leg only, is warm or tender, or is accompanied by breathlessness, fever or chest pain must be assessed by a healthcare professional the same day.

Lymphoedema and lipoedema

Lymphoedema is chronic swelling that occurs when lymph vessels or nodes are damaged or removed, most often after cancer surgery with radiotherapy, sometimes congenital. It is treated in healthcare by lymphoedema therapists with compression, manual lymphatic drainage, skin care and movement, and requires lifelong self-care. Lipoedema is a symmetrical accumulation of fat on legs and arms that is tender and does not respond to dieting, often confused with lymphoedema and overweight. Both conditions should be investigated through healthcare; self-care with light massage can be part of it but does not replace treatment. More in Lymphoedema – what it is and how it is treated.

Five ways to support the lymph every day

1. Move your calves. Walking, stairs, calf raises at the desk, cycling. The calf muscle is the lymph's most important pump.
2. Breathe deeply. Five slow belly breaths a few times a day; the movement of the diaphragm pumps the lymph in the abdomen and chest. Our simple exercise: in for four, hold for four, out for eight.
3. Drink water and cut the salt. Lymph is mostly water and gets more sluggish when you are dehydrated. Lemon in the water does no harm but is no magic.
4. Light massage in the right direction. Stroke, or glide a silicone cup with very light pressure, from the feet towards the backs of the knees and the groin, from the hands towards the armpits and from the centre of the face down towards the collarbones. Step by step: Lymphatic massage at home. The cup makes it easy to keep the pressure light and even: Curam Dynamic Cup for legs, Face Cup for face and neck.
5. Legs up and compression. Ten minutes with your legs above heart level in the evening, support stockings on long flights and for standing work.

To understand what lymphatic massage does, which side effects are normal and what to expect before and after: What is lymphatic massage? For the face: Lymphatic massage for the face. If you are considering machines: Lymphatic massage machine, cups or hands? And on swollen legs specifically: Swollen legs and feet.

Frequently asked questions about the lymphatic system

What does the lymphatic system do?

It returns surplus fluid from the tissue to the blood, absorbs fat from the gut and filters out bacteria, viruses and damaged cells in the lymph nodes as part of the immune system.

Why do lymph nodes swell?

Because the immune cells in the node multiply when they meet an infection in the area, for example in the neck during a cold. Nodes that are hard, keep growing for several weeks or are painless should be examined by a doctor.

What does it feel like when the lymphatic system gets going?

Lighter legs, less swelling, often urinating more the same day and feeling thirsty. It should not hurt.

Can you "cleanse" the lymphatic system with a detox?

No. The lymph and the liver clean the body on their own. What you can influence is the flow, through movement, breathing, water and light massage.

Does cupping help the lymphatic system?

Dynamic cupping with light suction in the direction of lymph flow is a simple way to do lymphatic massage on yourself and reaches areas that are hard with the hands. It does not replace care for lymphoedema.

Written by Curam. Last updated 17 October 2026. This is general information and does not replace medical advice. Swelling that comes on suddenly, in one leg only, or together with fever, breathlessness or pain must be assessed by a healthcare professional.