Children’s face swelling in the morning is usually caused by drinking too much water at night, allergic reaction, nephritis and other conditions. 1. Drinking too much water in the evening: a child’s face is swollen when he wakes up in the morning, which may be caused by drinking too much water in the evening. This is because drinking water before going to bed will increase the burden on the kidneys, and after going to bed, the kidneys will also reduce excretion. 2. Allergic reaction: If children are mosquito bites or eat allergic food and other conditions may appear allergic reaction, may appear in the morning face swollen symptoms. 3. Nephritis: nephritis may also cause children to get up in the morning, swollen face, nephritis patients usually have edema, mostly from the face, some patients will also be accompanied by fever, fatigue and other symptoms. Children get up in the morning face swelling, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.