The size of bones usually grows in harmony with themselves, and the thinness of physiological arm bones also means that other bones in your body are relatively small, which is nothing to worry about. Pathological bones are small and rare, mostly muscle atrophy caused by central nervous system diseases, but bones usually have no obvious deformation. I suggest you observe whether your arms are symmetrical, whether your muscles are developed and whether your muscle strength is normal. If there is nothing unusual, don't worry.

In addition, both physiological and pathological bone problems are difficult to be corrected by conservative treatment. Don't dwell on the landlord.