Your wrist is a joint where some muscles are attached to. But unlike your arm – where you can train your biceps and triceps – no actual muscle is present in your wrist. This is why its almost impossible for your wrists to grow in size.

Why does wrist size change?

Depends on environmental conditions buy mostly on your physiology. If you are being alottle more active at some parts of the day, or are say tying your shoes , working actively etc. your wrists will expand. Mines the opposite for some reason.

Does your wrist size change when you lose weight?

The wrist definitely shrinks from weight loss.