The most common cause of swollen feet after prolonged standing is local lymphatic flow obstruction or obstruction of lymphatic flow causing lymphatic fluid to accumulate in the lower limbs, resulting in swelling, pain and discomfort. For simple obstruction of lymphatic return or lymphatic return in the lower limbs, bed rest, elevation of the affected limbs, and oral medication to promote lymphatic return will usually provide significant relief in about 12-24 hours, and even the swelling of the lower limbs will disappear. Patients with hypercoagulability, such as those with high lipids, slow hemodynamics or elevated D-dimer, may also have lower extremity DVT secondary to lower extremity swelling due to prolonged standing, and further vascular ultrasound examination of the lower extremity is usually required to clarify the diagnosis. For patients with definite lower extremity DVT, further surgical treatment is usually required to achieve a cure.