The three types of marijuana plants include cannabis indica, cannabis sativa, and hybrids. As the name implies, hybrids are a combination of the two strains. Because there is limited research done on the impact of specific marijuana strains for chronic pain, recommendations based on specific strains have not been medically proven. However, according to a survey highlighted in the Journal of Alternative and Complementary Medicine published in 2014, participants preferred indica strains for pain management, relaxation, and sleep. In contrast, sativa strains would be used for energy boosts and mood improvements. Participants also reported that the indica strain of cannabis relieved non-migraine headaches, neuropathy, spasticity, and joint pain.