Is he under a lot of stress? Stress can lower the immune system's resistance to sickness.
Does he get plenty of vitamin C in his diet? When I was a girl, there was a period of time where I kept getting the flu over and over again. We lived in the mountains and perhaps were not getting enough fresh fruit, etc.. A doctor wanted me to take 1000 mg of vitamin C in the morning and 1000 at night and the Lord used that to help me and I stopped getting sick.
It would be best if he goes to the doctor since this is a frequent situation to check for underlying conditions that might be causing these disquieting symptoms. See private message.
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