Hello, Thank you for asking at HCM. Leg swelling is common when we stand for long time and especially at the end of a busy day. If the swelling is only on one side this is something that has to do with a problem locally and needs a quick attention, especially ultrasound, to rule out deep vein thrombosis. If the swelling is in both feet than you will need to have a heart ultrasound and creatinine levels in blood and probably if the rest come out normal you will need to check liver function. Some blood pressure medications might cause leg swelling but you did not mention to have been taking other medications other than HCTZ which does not generally cause swelling. Your doctor might choose to prescribe some diuretics, other than HCTZ, like lasix or spironolactone to help with edema. Even though the swelling you have might be transitory and not serious you will need to have a doctor visit and find the cause of it and have the needed examinations and proper treatment. I wish this is helpful and answers to your question.