Treatments consist of inserting hair-like sterile, single use needles into specific points. Upon insertion, one may feel a momentary sharp or stinging sensation; however, many report they don’t even feel the majority of the insertions. It is common to experience a deep ache for a short time in some of the points. The acupuncture needles may then be gently manipulated and some practitioners may use heat or even electricity with the needles. The depth to which the acupuncture needles are inserted varies according to the treatment and the practitioner; however, needles are never positioned deep enough to puncture organs (other than the skin). The needles are usually left in place for 5 to 20 minutes, usually no longer than 60 minutes, and then removed.