This is not something that I know much about....it is possible that either the chemo agents are causing anemia or that there is internal bleeding somewhere. The only way to know would be to ask the doctors..via your brother.
It is very difficult when you are not in a position to be given all the information easily.
The best you can do is to "be there" for him and let him know how much you care.
Best wishes to both of you.
Sara Anne
Diagnosis 2-08 Small papillary TCC; CIS
BCG; BCG maintenance
Vice-President, American Bladder Cancer Society
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