Is losing feeling in your fingers a side effect of CoolSculpting?

Nerve dysesthesia or anesthesia / hypoesthesia, or changes in sensation of the finger tips should not be caused by CoolSculpting fat reduction by Zeltiq of the abdomen.  There are contraindications to this treatment such as Raynaud's which is a circulation problem in which the arteries in the fingers spasm usually with cold environmental temperature. However,I am not aware that it has been documented that the blood flow temperature in a finger is in fact lower during the CoolSculpting treatment of the abdomen.  In addition, there is a rare disease in which cold agglutinins form during exposure to cold temperature and form antibodies that cause systemic problems.

It could be that people who develop numness or other nerve symptoms of distant areas on the body after CoolSculpting have a coincidence. If the arm was resting in a certain position during the one hour CoolSculpting treatment, possibly the "funny bone" or ulnar nerve was compressed and the ring finger feels differently now. Please see your primary care doctor who may wish to refer you to a neurologist for a work-up to explain the finger numbness.

The information provided in Dr. Shelton's answer is for educational purposes only and is not intended to constitute medical advice.  The information provided should not be relied upon as a substitute for consultations with a qualified health professional who may be familiar with your individual medical needs.

That's interesting.  I do not think your finger numbness is related to the coolsculpting treatment - but probably to something else.  Please go have that checked out.

Numbness from coolsculpting usually happens only in the area that was treated, or in an immediately adjacent area.  And typically the numbness is temporary.

CoolSculpting is FDA-cleared for the flanks (love handles) and abdomen and is proven to be a safe and effective treatment. Typically, there is minimal to no downtime after the treatment though patients may experience temporary pain or discomfort. Side effects can include redness, bruising, swelling, tenderness to the touch, cramping, itching, tingling, and numbness. Numbness can persist up to several weeks after a procedure. If numbness were to occur as a  result of CoolSculpting, it would occur on your stomach, not your hand.