Plantar swelling may be due to the following reasons: 1. Peripheral nerve compression may be present. This is often seen in patients with trauma or occupying lesions in the ankle canal at the inner posterior aspect of the ankle joint, which leads to pressure on the internal nerve and then a swollen feeling on the bottom of the foot. 2. It may be caused by excessive fatigue. This situation is often seen in patients walking long distances or doing excessive exercise, which leads to fatigue of the intrinsic muscles of the foot, or fatigue fractures of the foot, there will be plantar swelling, pain. 3, may be caused by edema of the foot. There are many possible reasons for edema in the foot, such as the patient needs to stand for a long time, or has heart, kidney, endocrine-related diseases, causing swelling here, which in turn causes swelling on the bottom of the foot. 4, this condition may also be caused by skin lesions of the foot. For example, the presence of vitamin deficiencies in the patient’s feet due to foot problems, or fungal infections in the feet that cause foot fungus swelling, may cause the swelling of the soles of the feet.