Summer Energy Opening in TCM: The Opening-Closing Principle

Summer Body Shifts: Why Heat Changes Everything

I have a small shrub called Rose of Sharon in the garden. In spring it grows small, pointed leaves in bright green. Then in July, the most beautiful pink flowers appear and they stay until the first days of autumn. When I see that blossom, I know summer has truly arrived.

The summer days in Switzerland are often quietly beautiful. A breeze coming from the lake, or from somewhere further, wakes me up on a lazy afternoon. Only on the few days each year when the temperature reaches 33 to 35 degrees Celsius do I find myself sweating through my clothes from simply sitting at home. On those days the heat changes everything. The appetite shifts. The head and legs feel heavier than usual. Even a short walk feels like moving against an invisible resistance. The heart beats faster with the smallest effort. Something in the thinking slows too.

I used to think this was the weakness of middle age. I have since learned it is something older and more purposeful than that.

TCM Philosophy: The Body and Season are One System

The ancient Chinese understood human beings as small but essential participants in a vast natural order. We live within nature, and nature lives within something larger still. The human body carries energy that interacts constantly with the energy field of its surroundings. Your skin is dry when you wake on a winter morning. Your body feels heavier on a humid day. This is not coincidence. It is connection — the living responsiveness between the body and the changing environment. The human body and nature are inseparable. What the season does, the body feels. What the body resists, the season amplifies.

When we move in harmony with that order and stay tuned to the orchestra, we are well. When we resist it, tension accumulates in the body. Left unaddressed, that tension becomes illness. This is the practical logic of preventive medicine, practiced for thousands of years.

開闔 (Kāi hé)— the opening and closing

Summer is the season when nature is at its most abundant and most alive. Plants are flowering and fruiting. The air is full of birdsong. Nature plays like an orchestra in full voice. It holds the most energy of the year, and it must open the pivot to let that energy move outward. To follow nature, the energy in your body needs to go outward too.

By contrast, winter is the season of rest. The trees are bare. Animals enter their winter sleep. The last note of the music fades into silence. As nature grows quiet, the body needs to preserve its energy, drawing inward for consolidation and restoration.

This rhythm of “opening and closing” is the governing principle of the seasons, and of the body within them. Summer opens. Winter closes. And the body, if you let it, follows faithfully.

You are meant to radiate in summer, to let energy rise just as heat rises from the earth. You are meant to sweat. The pores are meant to open. The heat is meant to move through you and out. This is the body's most efficient mechanism for releasing heat and clearing accumulated toxins. When you seal yourself inside air-conditioned rooms and avoid perspiring, the heat settles in the body until it becomes something harder to ignore.

But the “opening and closing” does not stop at the skin. The energy moves outward from you not only when your body sweats, but also when you think and express yourself. Do you have a side project that has been waiting too long? Ideas you have not yet written down? A conversation you have been afraid to start? A language you have planned to learn but not yet begun? Summer is the best season for inspiration and self-development, not because the conditions are ideal, but because the pivot is open. Use it before it closes.

Three summer practices

Go outdoors and sweat. Morning or evening, when the sun is gentler — walk, swim, move. The body's pores are the physical expression of 開闔 (Kāi hé)— the summer opening that TCM asks of you. Let them do their work.

Use rose hydrolat as a toner or face mist to keep the skin fresh through the heat. Rose carries the Fire element's opening energy in TCM — it supports the Heart meridian in the same outward, expressive direction the season is already moving. One or two sprays takes thirty seconds and changes the quality of the afternoon.

Write down one thing you have been postponing and one small step you can take this week. Not a plan — a beginning. The pivot is open. Use it.

Learn about TCM seasonal eating in summer.

Three oils for the open season

If 開闔 (Kāi hé) is the governing rhythm of summer — the pivot that opens so energy can move outward — then the oils you reach for in these months should do the same.

Bergamot is the opening oil. In TCM it carries both Wood and Fire — it belongs to the Liver meridian's function of smooth upward flow, and to the Heart meridian's capacity for warmth and expression. If you arrive in summer with a decision postponed, a conversation avoided, a project not yet begun, bergamot moves that stagnation outward. Western aromatherapy explains this through its primary constituent linalool, an alcohol with well-documented anxiolytic and mood-lifting properties that work directly on the limbic system — the brain's emotional centre. East and West arrive at the same conclusion through different paths: bergamot releases what is held.

Neroli opens without overstimulating. It encourages the Heart to express itself without tipping into agitation or anxiety. In TCM it supports the Pericardium, the Heart's protector, which governs the boundary between being open and being overwhelmed. Neroli is rich in linalool and linalyl acetate — an ester that is deeply sedative to the nervous system while simultaneously uplifting to the emotions, which is precisely the paradox TCM describes in the Pericardium's function: protecting the Heart's openness without it being overwhelmed. It relaxes smooth muscle to calm a physically racing heart.

Lemon disperses. Where bergamot opens and neroli encourages, lemon actively moves stagnant energy out through the surface — its pungent, upward-moving quality mirrors exactly what the season is asking the body to do through perspiration. Lemon's high limonene content — a monoterpene that stimulates circulation, supports lymphatic drainage, and activates the body's natural detoxification pathways — is the chemical expression of TCM's dispersing principle made visible under a microscope.

A simple blend for the height of summer:
Bergamot 2 drops
Neroli 1 drop
Lemon 1 drop

Diffuse in the morning. Let the pivot do what summer designed it to do.

A note on safety

Essential oils are concentrated plant extracts. A little goes a long way, and a few simple principles keep them working for you rather than against you.

Dilute before applying to skin. Never apply essential oil undiluted directly to the skin. For adults, a safe dilution for body use is 3 drops of essential oil per 10 ml of carrier oil — sweet almond, jojoba, sunflower oil all work well. For the face, keep it to 1 drop per 10 ml.

Bergamot is photosensitive. It contains bergapten, a furanocoumarin that reacts with UV light and can cause skin discolouration or burning. If you apply bergamot to the skin, avoid sun exposure on that area for at least 12 hours. In diffusion this does not apply — the concern is skin contact only. If you use bergamot topically, choose a bergapten-free (FCF) version, which is widely available.

Pregnancy. Neroli is generally considered safe in diffusion during pregnancy, but avoid topical application in the first trimester. Bergamot and lemon in diffusion are also considered low risk, but if you are pregnant, consult your midwife before introducing any new essential oil into your routine.

Children. Keep diffusion sessions short for 20 minutes maximum in rooms where young children are present. Avoid diffusing peppermint around children under 10, as its high menthol content can be overwhelming for a developing respiratory system. The three oils in this article — bergamot, neroli, lemon — are among the gentler options and are generally well tolerated.

Sensitisation. Using the same oil every day for extended periods can lead to sensitisation. The skin or respiratory system becoming reactive to an oil it previously tolerated. Rotate your oils through the season rather than relying on one blend exclusively. Your body, like the season, benefits from variety.

When in doubt, less is always more. One drop diffused in a well-ventilated room is enough. Aromatherapy works through subtlety, not intensity.

Before the flowers fall

The Rose of Sharon blooms for a single day. Each flower opens in the morning, holds itself fully open through the afternoon, and falls to the ground by evening. It is the “opening and closing” made visible — the rhythm of energy moving through its complete cycle, without resistance and without regret.

When I notice that the new flowers have stopped appearing and the days are growing shorter, I know the pivot is closing and summer is approaching its end. I always feel that the season has passed too quickly. I have stopped lamenting the heat. Instead I try to use it as an invitation to sweat, to do what I am passionate about, to review my year and catch up on what I set out to do.

Summer does not last. But what we do with it stays in the body long after the Rose of Sharon has finished blooming.