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Answer: Most people feel only a slight prick or tingling when the needles are inserted. The needles are very thin, much thinner than those used for injections, so pain is usually minimal. Some may feel a mild ache or warmth at the point, which is normal and usually temporary. Is acupuncture safe? Yes, acupuncture is generally safe when performed by a trained and licensed practitioner. Serious side effects are rare. Minor side effects can include slight bruising, bleeding, or soreness at the needle site. It’s important to let your practitioner know about any medical conditions or medications before treatment.