The specific causes of plantar pain are as follows: 1. plantar fasciitis: it is easy to have painful pressure on the bottom of the foot, especially in the morning, after a long rest and when walking on the ground. 2. heel spur: it is caused by degeneration of the heel bone, and it is also easy to have painful symptoms on the bottom of the foot when walking. 3. plantar fascia, ligament and tendon injury: it can also cause painful symptoms on the bottom of the foot. 4. flatfoot The symptoms of pain are more obvious after prolonged weight-bearing activities. After the patient develops plantar pain, the cause must be identified and treated to relieve plantar pain symptoms in order to restore the normal weight-bearing activities of the foot.