The baby’s hands are tender, rich in subcutaneous capillaries, blood flow is relatively large, easily stimulated by external factors to appear red and swollen phenomenon, most commonly by mosquito bites, or contact with flowers and trees allergic phenomenon, will cause the phenomenon of redness and itching. In addition, if you drink too much water, not timely excretion will also cause the phenomenon of swollen hands. These conditions do not last too long, but if they do not subside for a long time, we should consider the following pathological conditions, such as: 1) rheumatic immune diseases; 2) swollen hands caused by heart failure; 3) swollen hands caused by kidney diseases; 4) bacterial infections, caused by poor personal hygiene. These are only some of them, and there are many systemic diseases that can also cause swollen hands. If you have swollen hands for a long time, you should never take it lightly and go to the hospital for diagnosis in time.