Our expert says:
Swelling (Oedema) can be caused by heart failure and kidney problems (nephrosis). Water tablets increases the passing of water through the kidneys but if the kidneys are not working right, or the formation of the water is quicker than the forming of the swelling, it can override the effect of the water pills. It can also cause loss of important electrolytes. Have they done any blood tests? Have they said anything about heart problems?
He sounds to me like a very sick young man though.
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