The reasons for leg pain in secondary school students are as follows: 1, it may be caused by calcium deficiency, because secondary school students are in the peak period of growth and development, the growth of bones and muscles need a lot of calcium, so the amount of calcium needed is more when, if the intake is insufficient at this time, there will be symptoms of leg pain. 2, secondary school students due to the usual excessive amount of exercise, over-exercise, long-term exercise fatigue injuries, do not have a good get rest, resulting in excessive accumulation of lactic acid in the legs causing pain. So, give calcium supplement, give appropriate rest if there is no relief in the short term, the symptoms of leg pain in progressive aggravation, must go to the regular hospital in a timely manner, improve the necessary relevant examination, after the cause is clear, choose a reasonable treatment, so that the symptoms of leg pain can be effectively relieved.