Respected user, hi I evaluated your query thoroughly. * Seems more of uric acid crystals as per narration ( still require laboratory confirmation ) . Reasons may be - without any pathology ( normal ) - kidney stones - protein rich diet - gout - others . * Heart burn is not associated with it , separate entity caused by gastritis may be anxiety related or other issues need to be evaluated . Hope this helps you. Welcome for any further assistance. Thanks for using Healthcaremagic.com & giving me an opportunity to assist you. Wishing you fine recovery from the same. Regards dear take care.