Hi Thanks for posting on HCM Severe Charley horses could be caused by a number medical conditions.Some of these causes include: -inadequate blood flow to the muscle -muscle injuries -exercising in excessive heat or cold -overuse of a specific muscle during exercise -stress, most often in the neck muscles -not stretching before exercise -nerve compression in the spine -taking diuretics, which can lead to low potassium levels -mineral depletion, too little calcium, potassium, and sodium in the blood -dehydration Some of these causes may also trigger spasms in the chin muscles which may give you similar pains.The pain you had could have been triggered by one of these causes. The treatment options for this condition may include: nonsteroidal anti-inflammatory pain drugs like ibuprofen, anti-spasmodics like spasfon, myorelaxants like miorel, and physiotherapy.With respect to the intensity of your pain and the underlying cause, your Doctor will chose the best treatment options adapted for you. Hope my answer will help you Best regards