Very little comprehensive clinical research exists on the uses of medical marijuana in the treatment of various illnesses. That being said, countless patient testimonies attest to the efficacy of the treatment. We at CannaBest Medical believe this anecdotal evidence is substantial, and so do the people at PatientsLikeMe, who conducted a survey and found "a little more than 75% of users said they use medical cannabis because other treatments aren't as effective or cause too many side effects, or both." The survey also found that patients preferred the treatment because it was natural. They used it to treat pain, muscle stiffness or spasm, insomnia, anxiety, multiple sclerosis, fibromyalgia, depression, PTSD, and ALS.