The tendon floating up generally refers to the superficial veins on the body surface, which may be caused by physiological reasons such as long-term exercise and thin body shape, or it may be caused by pathological factors such as vascular diseases and liver diseases. 1. Physiological reasons: Generally speaking, the superficial veins on the body surface of each person may differ to a certain extent. Some people may exercise more in normal times, and the blood vessels supplying the muscle tissues will expand to a certain extent, which is manifested as the superficial veins of the limbs are more obvious. In addition, if the body type is thin and the subcutaneous fat content is low, the above situation may also occur, which is a normal phenomenon. 2 Pathological factors: Some patients with obvious dilatation and tortuosity of superficial veins may be caused by vascular diseases, such as varicose veins of the lower limbs, deep vein valve closure insufficiency of the lower limbs, etc. In addition, when there are serious lesions in the liver, the superficial veins of the lower limbs may be dilated to a certain extent. In addition, when there are serious lesions in the liver, it will cause high pressure in the portal vein and circulatory disorders in the inferior vena cava, which will be manifested as tortuous and dilated superficial veins in the abdomen, and common diseases such as cirrhosis of the liver, alcoholic liver disease and so on. The symptoms of floating tendons alone sometimes cannot determine the cause accurately, but also need to be combined with the characteristics of the medical history, other test results in order to make an accurate judgment, it is recommended to clarify the cause of the disease under the guidance of the doctor, and comply with the doctor’s instructions to standardize the treatment.