it is the cannabinoids from sativas that relieve your pain. so if the strain you grow does not contain sativa in it basicly it wont do nothing for your pain.Thc has nothing to do with pain relief or very little. Thc changes your mood. So hybrids containing sativa , pure sativas that's what you want. Look at the strain description on nirvana site you will see that only the strain with sativa in them are considered medical! Sativas can be a pain in the a.. to grow, so I recommend a hybrid gen, they grow nice and easy like indicas but contain the sativa for pain relief.