The most common factors for patients to feel swollen legs are as follows: 1. From the perspective of orthopedic surgery, the most common factors are lumbar disc herniation and lumbar disc bulge, or sacroiliac arthritis, sciatica and a series of other diseases, which lead to peripheral nerve radiculitis, or swelling caused by damage to large nerves. 2. 3. In diseases with poor venous reflux in the lower extremities, the legs may also feel swollen, such as deep phlebitis in the lower extremities and venous artery valve closure insufficiency. 4. In some patients with decompensated heart function, renal insufficiency and hepatic insufficiency, arteriovenous reflux may occur, which may also lead to 5. In patients with hypothyroidism, mucous edema of the anterior tibial region of the lower extremities can occur, which can also lead to clinical symptoms and manifestations of feeling swollen in the legs.