Venous thrombosis can be divided into deep vein thrombosis and superficial vein thrombosis, and hot compresses are not recommended for patients with deep vein thrombosis, because deep vein thrombosis causes thrombus to block the venous cavity, resulting in impaired blood flow back, and hot compresses will increase local blood flow, accelerate blood circulation and aggravate blood stagnation, which may aggravate the symptoms instead. Lower limb vein thrombosis mainly manifests as swelling, pain and other discomforts of the affected limbs, and later can cause varicose veins, so it is recommended that patients go to the hospital vascular surgery for professional treatment. If the thrombosis of superficial veins is more limited, the patient can apply heat. Local superficial vein thrombosis can be relieved by local hot compresses, but care should be taken to avoid burns and unnecessary stimulation such as squeezing and pressing at the thrombosis.