The common causes of three-year-old children’s face swelling in the morning include: allergy, local inflammation, acute nephritis and so on. 1. Allergy: often accompanied by skin rashes, contact with special objects or eating special foods. 2. Local inflammation: periodontal inflammation, mumps, etc. may cause facial edema, accompanied by pain, elevated skin temperature, and even fever, malaise and other systemic symptoms. 3. Acute nephritis: often appear in the cold, tonsillitis, accompanied by facial edema, edema in many parts of the body, oliguria, hematuria and other symptoms. Three-year-old children get up in the morning face swelling, there may be other causes, 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.