A thigh is obviously swollen: 1, may be due to excessive fatigue caused by the lower limbs of the blood circulation is blocked, resulting in a thigh swelling symptoms, after resting will generally subside. 2, due to obesity can also lead to two limbs of the thickness of the same. 3, there are people who have seasonal swelling. 4, cardiac insufficiency of the patient will also appear in the symptoms of a swollen thigh. 5, the tumor pressure on the veins, poor renal function, liver cirrhosis, can lead to poor venous return symptoms of thigh swelling. 6, the lower leg venous thrombosis can lead to the affected side of the swelling, must go to a regular hospital to improve the thigh swelling. The tumor compression of the veins, poor renal function, liver cirrhosis, can lead to poor venous return symptoms of swelling of the thighs. 6, lower extremity venous thrombosis can lead to swelling of the affected side of the thighs, be sure to go to the regular hospital, improve the lower extremity of the vascular ultrasound, you can make a definitive diagnosis. 7, it may be the limb of the local problem, such as trauma can also appear swelling. If there is no obvious positive signs in the detailed examination, it may be considered that the possibility of idiopathic edema is greater, or it may be due to local lesions. Therefore, the appearance of a thigh swelling, if the short-term through bed rest, elevate the affected limb, did not get any relief, must promptly go to the regular hospital, do not delay the condition.