Post-traumatic stress disorder (PTSD) is a type of anxiety disorder that’s triggered by a traumatic event that involved the threat of injury or death. Post-traumatic stress disorder can develop after someone experiences or witnesses an event that causes intense fear, helplessness or horror. Many people who are involved in traumatic events have a brief period of difficulty adjusting and coping, after which they improve and get better. In some cases, though, the symptoms can get worse or last for months or even years. Symptoms can sometimes interfere with normal functioning, sleeping, and interpersonal relationships. This is often when the diagnosis of PTSD is made. Three groups of symptoms are required in order to make the diagnosis of PTSD: (1) recurring re-experiencing of the traumatic event (troublesome memories, flashbacks, nightmares); (2) avoidance to the point of having phobias of places, people, and experiences that are reminders of the traumatic event and (3) chronic physical signs of hyperarousal, such as insomnia, trouble concentrating, irritability, anger, blackouts, and difficulty remembering things. PTSD sufferers often have emotional numbing that manifests as difficulty enjoying activities that they previously enjoyed, inability to look forward to future plans, and emotional distancing from loved ones. Conventional treatment for PTSD includes psychotherapy, learning coping skills, and family counseling. Medications such as anti-depressants, mood stabilizers, sleep aids, and anti-anxiety medicines are often prescribed. Some patients find relief with these treatments but it is well known in the medical community that PTSD is difficult to treat. Cannabis has been used by many PTSD sufferers with good results, especially for insomnia and anxiety. Cannabis can give PTSD patients a sense of well-being and serenity, and it allows them to continue to function with little to no adverse side effects. There are a number of researchers currently exploring the science behind the use of cannabis for treatment of PTSD and the results are promising. For now, PTSD patients that live in states where medical use of cannabis is legal can use it to help decrease the debilitating symptoms of their illness.