I was diagnosed with myasthenia gravis when i was 15 years old. When I was 16 i started smoking marijuana. Im now 37 and smoke mj ocassionally. Im now taking inmuran and prednisone for mg. I still have ptosis and had hand weekness in the left hand, until the dr put me on immuran. My question is, does marijuana cause thymoma/
Hi, Thanks for writing in. The marijuana is unlikely to have caused your Thomas. However, the myasthenia graves is the cause for Thomas and 20 percent of patients with myasthenia graves might develop Thomas after few years. Since you are having myasthenia graves from age 15 years therefore it has taken 22 years to manifest in to Thomas. The thymus is a gland that is part of immune system in child Chat Doctor.  However, in those with myasthenia graves there is active auto immunity which causes the thymus to develop in to a tumor in 20 percent patients and this is called Thomas. Please follow up with your doctor and get treated. Please do not worry.