Sinuses are air pockets located in the cheekbones, between the eyes and the forehead. Small channels connect the sinuses to the nasal passages, allowing mucus to drain into the nose from the sinuses and air to flow into the sinuses from the nose.

In the United States, acupuncture is an integral part of complementary and alternative medicine, incorporating techniques from Chinese, Japanese and Korean traditions. Some Westerners are skeptical of the practice, while others swear by it, reporting a plethora of beneficial effects.

Chinese medicine theory believes the body's energy, or qi, circulates through energy channels called meridians. These meridians correspond to the inner organs, which are thought to govern their energy flow.

Acupuncture is a healing art based in Traditional Chinese Medicine. Acupuncturists apply slim needles to specific points of the body to restore a balanced flow of vital energy, or "qi."

Thousands of licensed acupuncturists, including physicians and dentists, currently practice acupuncture in the United States, according to the National Center for Complementary and Alternative Medicine.

The risk of an adverse reaction from an acupuncture treatment is low, but after a deep session you may experience a feeling of lightheadedness or dizziness.

Nerve damage can result from a variety of causes, including injuries, infections, and exposure to toxins, according to MayoClinic.com. Symptoms of nerve damage may include pain, tingling, burning and loss of sensation.