The following three points can help determine whether it is plantar fasciitis: First, plantar pain, pain is characterized by pain on the bottom of the foot when walking, no pain or slight pain when resting, pain increases when walking too much or exercising too much, can also be manifested as prolonged lying, sitting after getting out of bed or getting off the ground when the pain in the heel increases, after a little activity, the pain is reduced. Second, touching and pressing the heel and the middle of the plantar area in front of the foot has obvious pressure pain, and the local fascia is tense and hardened. From the appearance, there can be mild swelling on the bottom of the foot, but the skin is not red or hot. Third, the radiographic examination shows no abnormalities in the bones of the foot, older people can have heel bone spurs, and for those who have been ill for a long time or have heavy inflammation, plantar ultrasound or MRI can show hyperplasia, hypertrophy, edema and inflammation of the plantar fascia.