i'm a licensed med user in nevada for nearly 5 years now and got it from having to go through multiple back surgeries and fusions...so here's my take;

if you're looking for increasing his appetite, almost any strain will help with that with sativa's leading the way but indica's can also help better with the nausea that comes with eating. indica's is also the one most pain users chose as it relaxes the muscles more and is already well known as a spasm reducer. but others like the uplifting, more cerebral buzz of a good sativa...which would be my choice too if wanting to clean the house or wash the car. but for peace and comfort, i'll take my sweet tooth or blueberry.