WebMD states that primary bedwetting, which is bedwetting that has occurred since an early age, can be caused by poor daytime toilet habits or the child not yet being able to hold his or her urine throughout the night. Secondary bedwetting, which is the sudden onset of bedwetting, can be caused by a urinary tract infection, emotional or neurological problems or diabetes.
WebMD describes poor daytime toilet habits as children delaying urination until the last possible moment, which is typically accompanied by leg crossing, squirming and groin holding to hold in urine. Urinary tract infections cause frequent and urgent urination along with pain or irritation during urination. Stressors, such as arguing parents, attending a new school, moving to a new home and being physically and sexually abused, can cause bedwetting. Injury or disease of the nervous system can affect the neurological controls needed to control urination.
Bedwetters typically do not have an underlying condition that makes them wet the bed, notes WebMD, but it does not mean that the child is lazy or disobedient. Bedwetting is often hereditary, and a child often stops bedwetting at the same age as his or her parent did. Bedwetting is often caused by developmental issues that remedy themselves over time.