The shin bone is also known as the tibia, and the crater on the tibia indicates edema, which is related to prolonged standing, venous disease of the lower limbs, heart disease, and so on. 1. Standing for a long time: the prolonged standing of a person’s calf will affect the blood circulation and lead to edema in front of the tibia, which mostly disappears after lying down and resting. 2. Lower extremity venous diseases: such as lower extremity venous thrombosis, lower extremity venous valve insufficiency, varicose veins, etc., affecting the blood circulation of the lower extremities, standing for a long time, a large amount of blood will be retained or refluxed to the calves, resulting in edema. If you stand for a long time, a large amount of blood will be retained or refluxed to the lower legs, and edema will appear. At night, the blood will return to the lower limbs after sleeping in the lying position, and edema will disappear in the morning. 3. Heart disease: when there is heart failure, pericardial effusion and other diseases, the patient’s calves will have edema symptoms, and it will get better after lying down and sleeping or elevating the affected limbs at night. The shin bone pressed with a pit in the morning disappeared there may be other reasons, such as kidney disease, liver disease, etc., it is recommended to go to the hospital in time to improve the examination, to clarify the cause of the disease, and to carry out targeted treatment.