Why is one thumb smaller than the other?

My thumb on my right hand ( its fingernail) is bigger than the left 1 . I dont mean the nail the actual thumb is bigger than the other. is this bad?

That's not unusual. It could be that it's used more than the other or an inherited trait. Look at a pro tennis player's arms. The arm that handles the racquet is always much bigger than the other. Like the rest of our bodies, our hands are all different sizes and shapes. There's nothing "bad" about that.

hi my thumb on my right hand is nearly twice as big as my left one, jayne x