Cannabis has been used in medicine for several hundred years. First of all, different ethnic groups and societies have made use of it. It was in the seventeenth century that cannabis entered western medicine for the treatment of epilepsy, migraines, neuralgia, convulsions, spasms and other ailments.
For various reasons (inconstancy of the therapeutic activity of cannabis, difficulty in fixing the dosage, etc.), treatments disappeared in the first half of the 20th century. It is around 1970, following various works, that the interest for this plant reappeared. A high number of claims about therapeutic benefits have led to an increasing number of therapists supporting the use of cannabis to treat certain physical and mental illnesses.