Reflexology is built on the idea that the sole of the foot is a map. The arch corresponds to the spine. The pads of the toes correspond to the head and sinuses. The base of the heel corresponds to the lower pelvis. A practitioner who works this map applies focused pressure to specific points on the foot in order to reach, indirectly, the corresponding region of the body.
I am cautious about claims I cannot verify, and I have heard some claims made about reflexology that go further than I would. But the foot is unquestionably one of the most nerve-dense regions of the body, and sustained pressure to specific points on the foot demonstrably produces effects elsewhere. Whether those effects follow the map exactly is debated. That they happen is not.
What a serious reflexology session looks like
It is sixty to ninety minutes. You lie on a recliner or a table with your feet exposed. The practitioner uses thumb-walking — a small, sustained, advancing pressure along the sole — to cover the entire foot systematically. They will pause at points that feel different to them and hold those points for thirty seconds, sometimes longer.

You will feel a lot of small, sharp sensations during the session. Some of them will be quite intense; some of them will surprise you by where they land. Most of them resolve quickly. By the end of the hour you will, almost without fail, feel as though your whole body has been to the spa, even though only your feet have been touched.
What a serious reflexologist does not do
They do not diagnose. A practitioner who tells you, after a foot session, that you have a problem with your liver or your kidneys is overreaching. They may have felt a tender point in the corresponding region of the foot, and that point may be worth knowing about, but it is not a diagnosis and a serious practitioner will be careful to say so.
They also do not promise cures. A foot session can move fluid, calm a nervous system, and reduce certain kinds of pain. It is not a treatment for disease, and a serious reflexologist will not pretend it is.
The foot is a small territory. A practitioner who treats it carefully treats the whole body.
If you are sceptical, try one session and watch what your sleep does that night. I have sent serious sceptics in for one session and they have come back asking for the practitioner's number.

