Children’s thumbs suddenly swollen, consider may be trauma, angioneurotic edema and other factors. 1. Trauma: If the child’s thumb is hit or hit by a heavy object, it will cause the local soft tissue and capillaries to rupture, which will lead to the sudden swelling of the situation. 2. Angioneurotic edema: If a child’s thumb is bitten by a mosquito or a bee, it will cause the saliva of the mosquito or the bee to stimulate the immune system, which will cause the local blood vessels to dilate, leading to the exudation of tissue fluid and causing the thumb to suddenly swell up. Children’s thumbs suddenly swollen, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.