Canadian law describes a state of disease for which medical marijuana can be prescribed that applies to a lot of symptoms that are common to many different conditions.
- Multiple Sclerosis
- Chronic Pain
- Spinal Cord Injury
- Sleep Disorders
- Compassionate end of life care, and more.
Health Canada’s Site  gives these catagories:
This category is comprised of any symptoms treated within the context of providing compassionate end-of-life care; or the symptoms associated with the specified medical conditions listed in the schedule to the Regulations, namely:
- Severe pain and/or persistent muscle spasms from multiple sclerosis;
- Severe pain and/or persistent muscle spasms from a spinal cord injury;
- Severe pain and/or persistent muscle spasms from spinal cord disease;
- Severe pain, cachexia, anorexia, weight loss, and/or severe nausea from cancer;
- Severe pain, cachexia, anorexia, weight loss, and/or severe nausea from HIV/AIDS infection;
- Severe pain from severe forms of arthritis; or
- Seizures from epilepsy.
Applicants must provide a declaration from a medical practitioner to support their application.
This category is for applicants who have debilitating symptom(s) of medical condition(s), other than those described in Category 1.
Under Category 2, persons with debilitating symptoms can apply to obtain an Authorization to Possess dried marijuana for medical purposes, if a specialist confirms the diagnosis and that conventional treatments have failed or judged inappropriate to relieve symptoms of the medical condition. While an assessment of the applicant’s case by a specialist is required, the treating physician, whether or not a specialist, can sign the medical declaration.