Although cannabis remains illegal on the federal level in the United States, some individual states have legalized cannabis for valid medical purposes (and two states, Washington and Colorado, have legalized cannabis both medically and recreationally).
Here's a list of which states authorize medical marijuana for valid, qualified patients. Each entry includes a link to the state's qualifying conditions, as well as a rundown of which medical conditions and symptoms must be verified by a physician in order to get authorized as a valid medical marijuana patient. Please note that some states allow physicians to approve other medical conditions not listed on a case-by-case basis, so check with your doctor. Please be aware that Leafly’s crowd sourced strain data does not constitute professional medical advice.