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Occasionally patients will describe recurrence of their normal arm or shoulder pain during administration of the medication. This is viewed as a reassuring sign that the medication is going to the right place and sensation usually disappears very quickly. Other possible risks of this procedure include, bleeding, infection, or the injection of medication into a blood vessel which potentially can cause seizures. These risks are extremely rare, and your physicians will be continually monitoring your vital signs in order to guard against these complications.