Hello lybrate-user, first congratulations your son survived blood cancer
. Ayurved helps you improve his immunity. Avoid oily, spicy, junk food, package food, soft drinks etc. Non-irritating and bland diet
, hot water
, lemon, green and leafy vegetables particularly having sour and bitter taste. You can also doing this at home: 6-7 basil leaves 5-6 cloves (powder) 2-3 black piper 1/4 teaspoon ginger paste all this add in 150 ml of water then boiling mild flame
and reduce to 100 ml. Later filtered and allowed to warm o it's own. Then add 2 teaspoon of honey and drink .it gives him relieved. For further details can online consult because I also need some more details.