For thigh swelling and pain, this is more common in clinical practice, and the most common cause is due to trauma. When a localized trauma occurs, a localized soft tissue injury or fracture can manifest as swelling and pain in the thigh. This is generally easy to diagnose. If the pain is significant, X-rays can be taken to check. There is also thrombosis of the lower limbs, the local circulation is not good can also be manifested as obvious swelling and pain. If it is caused by trauma, the first thing to rule out is whether there is a fracture. In the absence of fracture, it is enough to pay attention to rest. You can elevate the affected limb appropriately, and the swelling will subside slowly. If it is caused by thrombosis, ultrasound examination should be carried out for the lower limbs, mainly to look at the blood vessels. After the diagnosis is clear, treatment for the cause of the disease, so as to achieve obvious results.