Usually not. Acupuncture is a safe method of encouraging the body to promote natural healing and improve function.
When done properly, acupuncture rarely if ever causes serious side effects. Many people feel a brief stinging sensation, like a pinprick, during insertion of the needles. Others experience a dull ache around the needle after it goes in.
A side effect that I have seen in our own practice is the original symptoms worsening for a few days after an acupuncture treatment. Sometimes other general changes in appetite, sleep, bowel or urination patterns, or emotional state may be triggered. These should not cause concern, as they are simply indications that the acupuncture is starting to work. Acupuncture is smoothing out blocked Qi (energy) that is stuck in areas of your body. When a garden hose gets a kink in it, the water stops flowing. When you straighten the hose, the built up pressure makes the water burst out in the beginning. This is what can happen when you first have acupuncture.
It is also common with the first one or two treatments to have a sensation of deep relaxation or even mild disorientation immediately following the treatment. These effects should wear off within 24-48 hours.
Occasionally, few sensitive patients have serious reactions, such as dizziness, sweatiness, or nausea, these problems usually clear up on their own within a few minutes, without any lasting harm to the patient.
While Acupuncture is an extremely safe form of physical medicine, here are some rarely seen contraindications and risks.