..oh..and as for the chemo, sometimes it can cause hearing loss, so if his ears start to ring a little, you will need to let his chemo doctor know about it. Some types of chemo can also cause some short term memory loss. The best thing to do is buy him some books and puzzles and hand-held video games to play to keep his memory sharp. We did that for my husband and it really seemed to work well. No memory loss.