It seems like you have Brachydactyly D, or “Stubby Thumbs”. Brachydactyly is an inherited condition where the thumb bone is shorter and stubbier. It has no other effect, and usually gives no problem to who has it. read more
Best Answer: bad posture, stand up with your shoulders back a little..its a mix of that and big shoulder blades, mine are hidden but when i bend my arms back like in stretching, people are like WHAT THE FREAK hahaha. read more