Is bedwetting in children a psychological problem or a physiological problem?

Patient's question:

My daughter is now over 3 years old, but recently, when playing at home at night, she always wets her pants every day. Sometimes it's just a little, and sometimes it's more. We ask her every 15 minutes if she has peed, and she always says no, but then she wet her pants shortly after. We have scolded her many times, and she has promised not to wet her pants the next day, but it's still the same the next day, and it always happens between 6:00 and 8:00 PM. During the day at kindergarten, the teachers say she will voluntarily signal when she needs to use the bathroom. She has never wet her pants, and she also rarely wets the bed at night. We have tried many solutions, but nothing has worked. I wonder if this is a psychological or physiological issue?

Doctor's answer:

Hello, the reasons for bedwetting;
1. Weak spleen and stomach, functional disorders, leading to a weak bladder;
  2. Underdeveloped or delayed central nervous system development, causing urinary signals to fail to reach the brain in a timely and accurate manner;
  3. Reduced binding force and weakened function of the bladder sphincter, leading to the bladder's inability to properly control urination.
  These three pathological causes mutually influence and restrict each other.

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