Considering medical marijuana? How to get a card and potential uses Medical marijuana differs from recreational weed as it is formulated to treat certain conditions. Medical marijuana can be used for managing symptoms of anxiety, insomnia, chronic pain, and nausea. To get a medical marijuana card, contact a primary care physician or a medical marijuana clinician. While marijuana remains federally illegal, a growing number of states have legalized medical marijuana for relief from conditions like Crohn’s disease, insomnia, and glaucoma. In fact, millions of Americans across 36 states and 4 territories are legally registered to use medical marijuana. If you’re interested in using medical marijuana, here’s your how-to, comprehensive guide.