There are several possible causes of pain at the bottom of the right rearfoot: first, bone spurs of the heel bone, when the heel bone has osteophytes, it can stimulate and compress the soft tissues of the sole of the foot and cause pain at the bottom of the rearfoot, then early X-ray of the heel bone should be taken for early diagnosis and treatment; second, fasciitis of the sole of the foot, fasciitis of the sole of the foot can also cause pain at the bottom of the rearfoot, often due to cold or exertion. Third, kidney deficiency, often due to kidney deficiency, resulting in pain at the bottom of the back of the right foot, which can be accompanied by symptoms of weakness and weakness of the waist and knees, which should be diagnosed by Chinese medicine, and after diagnosis, early kidney treatment should be carried out.