Swelling of the big toe joint can be caused by several reasons: First, bunions caused by bunion, mostly seen in women, when there can be an obvious deformity of the big toe, and at the same time in the joint at the root of the big toe can appear medial enlargement, which is a manifestation of bunions, can appear obvious pain, limited activity, this time to take early X-rays of the foot and physical examination to early diagnosis, if If the condition is serious, surgery may also be considered. Second, gout, when gout involves the joints, can appear the root of the big toe joint swelling and pain, often for acute onset, then we should check the blood uric acid and foot x-ray, to early diagnosis and early treatment.