It may be normal for children to have one hand hot and one hand cold, but it may also be caused by cold air stimulation, fever, etc. 1. Normal: If a child plays with one hand too much activity, and one hand for a long time in a static state or by the pressure, it will cause poor blood circulation, resulting in a child with a hot hand and a cold hand. At this time, appropriate activities or massage the cold hand, you can promote the temperature of the hand gradually recovered. 2. Cold air stimulation: If a child’s hand is exposed for a long time or touching cool water, the hand for a long time by the cold air stimulation, will lead to local vasoconstriction, resulting in a decrease in skin temperature, will also lead to a child’s hand hot and a hand cold. 3. Fever: When children are infected by bacteria, viruses and other pathogens, the body will produce an immune response, resulting in body heat, children’s peripheral circulation of the limbs is not particularly good, in the period of rising body temperature can also lead to children appearing in a hot hand and a cold hand. Children with one hot hand and one cold hand, 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, give targeted treatment or treatment.