Hi and welcome to Healthcaremagic. I understand your concerns and I will try to help you as much as I can. This is probably a consequence of venous insufficiency. It means that your veins are dilated and there is blood stasis after long sitting or standing. This is not as serious issue and to confirm my diagnosis you need to do ultrasound. In mild cases it can be treated with elastic stockings, avoiding prolonged sitting or standing, weight regulation and detralex ointment. In severe cases surgery may be required as a permanent solution. It is also advisable to reduce salt in your diet, keep legs elevated while sleeping and regulate blood pressure. Other causes such as kidneys and heart disorders are less common and should be considered only if venous insufficiency is ruled out by Doppler ultrasound or venography. I hope I have answered you query. If you have any further questions you can contact us in every time.