If a patient wakes up in the morning and feels pain as soon as the foot hits the ground, it may be due to the following reasons: 1. This condition may be caused by trauma to the foot, such as a minor soft tissue contusion, fracture or puncture injury with a foreign body in the foot the day before. At the time of onset, the patient’s attention may not be drawn, and after the patient has rested overnight, serious inflammation or infection may develop here secondary to the above symptoms. 2. This condition may be caused by ischemia of the foot, and some patients may sleep with prolonged excessive pressure on the foot or excessive flexion of the lower limbs, which may cause ischemia of the foot. In the process of suddenly going down, the patient may feel a particularly obvious pain, numbness or itchiness in the foot, and sometimes also feel obvious weakness. 3, this situation may also be caused by severe swelling of the foot, such as the patient has a blood clot or trauma to the lower extremity, followed by severe swelling of the foot. Such patients may also experience pain due to high pressure inside the foot during the process of going down.