Swelling, tightness and stiffness of thigh muscles may be caused by keeping the same position for a long time, catching cold and other physiological reasons, or it may be caused by strained leg muscles or hip joint lesions such as osteoarthritis, necrosis of the femoral head and other diseases. Relief methods are different for different reasons, and the treatments include general treatment, medication and so on. 1. Physiological reasons: keeping the same position for a long time or catching a cold may lead to poor blood circulation in the legs, and the accumulation of metabolites may cause symptoms, which can be relieved by proper massage or hot compresses on the leg muscles. 2. Muscle strain: muscle strain and other reasons may lead to tissue, ligament damage, triggering muscle stiffness symptoms, you can take some of the soothing medication such as blood circulation capsules, or take ibuprofen and other pain relievers to relieve the symptoms. 3. Hip joint lesions: Hip joint lesions such as osteoarthritis and necrosis of the femoral head may lead to symptoms of spasm and stiffness of the muscles around the hip joint. Treatment needs to be based on general therapy and medication to treat the primary disease to solve the problem completely. When patients experience symptoms of swollen, tight and stiff thigh muscles, they should seek medical attention in time for relevant examinations to identify the cause of the disease and then carry out targeted treatment. Avoid standing for a long time and walking with weight to avoid excessive pressure on the legs.