There are 14 causes of bedwetting in adults
3. Small Bladder
You might be surprised to learn that different people have different sizes of bladders. The reason for this variation is usually genetics and random mutations during pregnancy. The size of the urethra is not always related to the total size of a person. A large person can be born with a smaller bladder, and vice versa.
You can imagine that a smaller bladder will reduce your capacity to store fluids. This may make bedwetting more likely, as you will fill up quicker than someone who has a larger bladder. A smaller bladder can also put more strain on the muscles, which could lead to a bedwetting accident. If you are overweight, losing weight can help alleviate the symptoms of a small bladder.