I’m having symptoms of gastritis/peptic ulcer
Stooling weight loss and a couple of others but when this newly started I weighed about 68kg then over the course of three months I noticed my body muscles and mass were changing
My wrists have become more skinny I can feel an overall lightness in my body and accurately I’ve checked my weight in so many hospitals I’ve gotten as low as 62kg but I just checked now and the scale shows 66kg meaning I added 4kg extra but visibly my arms and wrist are still skinny I can’t wear tshirts as at now but the scale says I added weight

Could the scale be lying? Or could it be I’m losing muscle instead of weight
I’m confused