Back pain after drinking is most likely due to back fasciitis, where inflammation produces exudation from the surrounding soft tissues, leading to soft tissue adhesions and causing pain. After drinking alcohol, the peripheral blood vessels dilate, blood volume increases, soft tissue pressure rises, and exudation increases at the injury or inflammation, especially as the pain-causing substances are released, triggering localized pain. Patients with back fasciitis can experience significant pain if they suddenly move their back after sleep and rest, and after daytime work and proper activity, the pain symptoms can be slightly relieved. In other people, back muscle injury can occur if straining, getting cold, or over-exercising, and drinking alcohol can cause increased bleeding and exudation from the injury, leading to increased pain. Most soft tissue injuries or lesions can be aggravated by alcohol consumption leading to pain.