The common causes of women feeling urination when lying down are: urinary system infection, overactive bladder syndrome, cardiac hypofunction, and psychosomatic factors. 1. Urinary system infection: when a woman has a urinary system infection, due to bacteria and other pathogenic microorganisms that stimulate the urethra and bladder, there will be redness, swelling and erosion of the mucosa. When female patients lie down, a small amount of urine will stimulate the mucous membrane, which in turn produces the desire to urinate and the symptoms of frequent urination and urgency. 2. Overactive bladder syndrome: Its common symptoms are frequent urination, urinary urgency and increased nocturia. Usually patients with this disease have an overly sensitive bladder, so it is easy to feel the urge to go to the toilet when lying down. 3. Decreased cardiac function: it usually causes double lower extremity edema. When women lie down when the blood volume increases, and the glomerular filtration rate increases, the original urine production is also increased, so it will lead to the patient to lie down on the symptoms of wanting to urinate. 4. Psychological factors: if there is too much tension, anxiety, can also lead to the body in the lying down relaxation produce strong urinary thoughts, it is recommended to regulate, relax mood. In short, women lying down feel urine, it is recommended to go to the regular hospital in a timely manner, a clear diagnosis of the symptomatic treatment.