Plantar pain in the morning is commonly caused by the following reasons: First, the most common is plantar tendonitis, plantar tendonitis has a typical symptom is that when you get up in the morning, the first step to walk on the ground will appear plantar plate, plantar pain, and then walk a few steps after the pain can be partially relieved. Plantar tendonitis is mainly due to the recent excessive weight-bearing walking or strenuous sports, which will cause the plantar tendon membrane to be subjected to more loads, the tension of the plantar tendon membrane will rise, which may lead to the skin nerves in and out of the tendon membrane to be compressed, and also cause the plantar tendon membrane of the aseptic inflammation, which is manifested as pain in the soles of the feet. Second, there may be flatfoot syndrome, flatfoot syndrome often leads to a sharp rise in the load on the plantar tendon membrane, which may cause plantar tendonitis under normal activity level, and may also cause plantar pain.