Moxa is burned to provide penetrating heat. This is called moxibustion. The suction stimulates the flow of energy. If the cups are left on for a long time they can leave a red mark. Some practitioners use small beads or tiny needles held in place with adhesive to keep pressure on an acupuncture point for a few days.
Some people feel slight pain, numbness or tingling when acupuncture needles are inserted.
In rare cases, people will feel dizzy or nauseated during acupuncture. There may be a drop of blood when a needle is removed. Acupuncture has far fewer side effects than most western medicines. You should not go for an acupuncture treatment if you have had any alcoholic beverage within an hour, or if you are using any recreational drugs. Be sure your acupuncturist knows if you are pregnant.