Cupping is a practice used in traditional medicine in several parts of the world, including China and the Middle East. It involves creating suction on the skin using a glass, ceramic, bamboo, or plastic cup. Negative pressure is created in the cup either by applying a flame to the cup to remove oxygen before placing it on the skin or by attaching a suction device to the cup after it is placed on the skin.
Research has been done on cupping, but most of it is of low quality. Cupping may help reduce pain, but the evidence for this isn’t very strong. There’s not enough high-quality research to allow conclusions to be reached about whether cupping is helpful for other conditions.
Cupping leaves temporary marks on the skin. It can also cause side effects such as persistent skin discoloration, scars, burns, and infections, and it may worsen eczema or psoriasis. Because cupping equipment can become contaminated with blood, using the same equipment on more than one person, without sterilization between patients, can spread bloodborne diseases such as hepatitis B and C.
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