Adult bedwetting without precursors may be due to conditions such as stress incontinence, organic urine loss, and filling incontinence. 1. Stress urinary incontinence: the etiology is more complex, may be due to anatomical relationship changes, pelvic floor muscle relaxation, surgical injury and other conditions, and also considered with age, childbirth history, obesity, heavy physical labor and other factors. Usually, patients will experience involuntary leakage of urine when abdominal pressure is increased by coughing, laughing, or weight bearing. In severe cases, urinary incontinence occurs when there is a change in the position of the slightest activity lying down. 2. Organic enuresis: it can occur at any time, usually due to lower urinary tract obstruction, cystitis, neurogenic bladder and other diseases, patients are often accompanied by urinary incontinence, but most of the patients in the improvement of the disease, the symptom will also improve. 3. Filling incontinence: usually due to urethral stones, urethral stenosis and other conditions, as the above mentioned diseases can induce chronic bladder retention, when the bladder is overfilled to its maximum capacity, a small amount of involuntary overflow of urine will occur. It is recommended that when adults wet the bed without any precursor, they also need to consult a doctor in time to find out the cause of the disease and then take reasonable treatment measures under the doctor’s guidance.