当幼儿自诉下肢疼痛、经查看又未有外伤时，教师和家长应想到以下原因。１．炎症。当幼儿出现下肢持续疼痛并伴有体温上升等症状时，很可能患了化脓性骨髓炎、关节炎或风湿病。经验血后，可发现白血球上升，炎症反应呈阳性。２．缺乏维生素Ｂ１。幼儿体内缺乏维生素Ｂ１，... When the child complains of lower extremity pain, after examination and no trauma, teachers and parents should think of the following reasons. 1. Inflammation. When a child has persistent lower extremity pain accompanied by symptoms such as an increase in body temperature, it is likely to have purulent osteomyelitis, arthritis or rheumatism. After the experience of blood, white blood cells can be found to rise, the inflammatory reaction was positive. 2. Lack of vitamin B1. Children lack of vitamin B1, ...