Cupping 拔罐

What it is

A flame flashes inside a glass or bamboo cup; the cup lands mouth-down on the skin; the cooling air contracts and pulls the flesh up into a firm vacuum kiss. (Modern clinics often use pump-valve cups — less theater, same suction.) Cups sit still, or glide over oiled skin, typically on the back and shoulders. The tradition frames it as moving stuck qi and blood and drawing out pathogenic factors; the felt experience is something like a deep, stationary massage in reverse^[1]. "Wet cupping" — pricking the skin first to draw blood — is a distinct, more invasive variant.

About those marks

The circles that fascinated the Olympics photographers are broken surface capillaries — painless bruises, in effect — that fade over days. In the traditional reading, their darkness diagnoses the degree of stagnation; in the physiological reading, they mark suction, nothing more. They are expected, not a complication.

What the evidence says

Candidly: thin. The NIH's summary is that cupping research is mostly of low quality; it may reduce pain — musculoskeletal and back pain lead the trials — but the evidence is weak, blinding is nearly impossible, and robust conclusions don't yet exist^[2]. Athletes' testimonials are enthusiasm, not data.

Safety — the part worth reading

Dry cupping by a trained practitioner is low-risk: the issues are persistent discoloration, occasional burns from flame technique, and skin infection^[2]. Wet cupping raises the stakes: reused, unsterile equipment can transmit bloodborne diseases including hepatitis B and C^[2] — single-use lancets and sterile technique are non-negotiable, and the marks can be mistaken for abuse in children, a documented source of real trouble. Skip cupping over broken skin, and skip wet cupping entirely unless a licensed professional can show you their sterilization practice.

Where it sits in the grove

Cupping is folk medicine the whole ancient world shared — Egyptian, Greek, Islamic, and Chinese practice all kept cups. It survives because it feels unmistakably like something; whether that something outlasts the marks is exactly what the trials haven't yet settled.

Reviewed 2026-08-25