Children do not have a fever but no spirit, drowsiness to consider the following several causes: 1, the initial stage of the cold, fever symptoms are not obvious did not appear fever, but can appear no spirit, drowsiness and other symptoms, light without special treatment, observe changes in the condition mainly. 2, dehydration, mostly seen in the summer or sweltering environment too little water or sweating, excessive diarrhea leading to dehydration, mild dehydration does not necessarily fever, but the child is very sensitive to dehydration, can appear drowsiness, headache, dizziness and other mental symptoms. 3, sleep deprivation, especially in young children of low age have a high demand for sleep, and are themselves very sensitive to lack of sleep. sleep deprivation due to various reasons, such as improper feeding, disease and other reasons, can appear drowsiness, mental discomfort, circadian rhythm disorders, which can lead to excitement at night and drowsiness during the day. For children with drowsiness to closely observe the presence of other accompanying symptoms, and changes in the condition, a clear cause of timely adjustment will slowly return to normal, if accompanied by headache, crying and restlessness, irritability, nausea, vomiting, etc., is likely to be caused by disease to seek medical attention.