Pain and discomfort on the outside of the knee while running. It may be a localized ligament strain, or it may be a lateral meniscus injury, or other bone problems that cause pain and discomfort. Still need to go to the hospital in time to find a doctor’s interview, the doctor combined with the examination of the preliminary analysis. If you consider meniscus damage, you need to improve the knee MRI to accurately determine the extent of meniscus damage. If you consider bone lesions, you need to routinely improve the X-ray examination of the knee joint. According to the results of the examination, then do the appropriate treatment. Avoid long-distance walking and strenuous exercise for the time being. If it is just a general ligament strain, in addition to rest, the local area can be sprayed with some swelling and pain aerosol, in addition to creams, such as pain-relieving cream. If the meniscus injury, minor can be conservative treatment. But if the more serious meniscus injury, need to consider arthroscopic treatment.