Study Summary: This study explores a new way to help Veterans with long-term pain and PTSD (Post-Traumatic Stress Disorder). PTSD is a mental health condition that some people develop after experiencing a shocking, scary, or dangerous event. The treatment involves using a device called tDCS (transcranial direct current stimulation), which is a painless, gentle brain stimulation therapy. The device sends low-level electrical currents to specific parts of the brain to help reduce pain and improve mental health.

Eligibility: Participants must be Veterans or Service members aged 18-89, living in Georgia or Florida for follow-up. They should be willing to use the tDCS device and meet other health criteria. People with certain medical conditions, like pacemakers or seizure disorders, cannot join.

• Study involves a short-term therapy program with tDCS sessions.
• Participants will come to the Brain Health Center in Atlanta for the study.
• This study does not use opioid medications, focusing on safe, non-drug therapies.

Participants will also have blood and saliva tests to check for changes in a protein called BDNF (brain-derived neurotropic factor), which might be linked to improvement in symptoms.