The symptoms of swollen feet in the morning may be caused by physiological factors, but also due to rheumatoid arthritis, varicose veins and other diseases. 1. Physiological factors: prolonged standing and upright position will lead to poor venous blood return, resulting in swelling of the feet. It is recommended that patients avoid standing for a long time, and can do some exercises to increase the blood return, so as to relieve the symptoms. 2. Rheumatoid arthritis: Rheumatoid arthritis can cause swelling of the ankle or knee joints, which can limit the venous return of the lower limbs, leading to the symptoms of swollen feet. 3. Varicose veins: Due to the incomplete closure of the venous valves in the lower limbs, the venous blood flow backs up and the blood accumulates locally, which increases the permeability of the venous wall and blocks the blood return, and finally leads to swelling of the lower limbs, causing the symptoms of swollen feet. Patients with symptoms of swollen feet in the morning, may also be due to deep vein thrombosis and other diseases, it is recommended that patients seek medical attention in a timely manner, to clarify the cause of the disease, and comply with the doctor’s instructions to standardize the treatment.