Medical marijuana can improve an ALS patient’s quality of life. Many of the symptoms that ALS patients experience, like muscle spasticity, are approved for medical cannabis treatment.The muscle stiffness or spasticity caused by amyotrophic lateral sclerosis interferes with your daily life, such as by making walking difficult. Some studies have indicated that medical cannabis can help with muscle spasticity and make it easier to live your life. One of the symptoms associated with ALS, chronic pain, can make living with the disorder challenging. Medical cannabis enhances the cannabinoids in your body that relieve pain.