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Thanks for your question.
You are right that there are many pathologic causes causing ankle swelling, however several nonpathologic mechanisms may also cause leg swelling. For example, prolonged sitting, standing, or immobility may cause bilateral swelling of the ankles. This swelling usually affects the foot and disappears with rest and leg elevation.
Therefore if your doctor has examined you and ruled out the pathologic causes including venous problems causing ankle edema, you have nothing to worry and just continue with the treatment and follow up with your doctor.
Thanks for your reply.
The gradually development of the swelling is due to the result of excess fluid in your tissues. This is unlikely to be due to heart, liver, or lungs since in these conditions the swelling will not likely decrease with activity. Also there would be other accompanying symptoms if this swelling was due to pathologic conditions. Another factor is the isolated ankle swelling which is most likely due to gravity and sitting or staying in one position for too long, since in pathologic conditions there may be swelling in other regions of the body as well.
Hence there is no need to worry, just certain measures such as moving and using the muscles in the ankle may help pump the excess fluid back to your heart. Also limiting salt intake will help. Massaging and elevating the leg will also be beneficial. Losing the excess weight and exercising will also help.
Yes the swelling will decrease with activity and with contraction of the calf muscles. Propping your feet up also will be beneficial.
Yes based on this isolated symptom that you are having, it is less likely related to failure of your heart, liver, or kidney.