Back pain can be described as feelings of aches and pain located throughout a person's back. It may occur as neck pain (cervical), middle back pain (thoracic), lower back pain (lumbar), or coccydynia (tailbone or sacral pain). However, the lumbar region is the most common area for pain, as it supports most of the weight in the upper body. The pain itself can range from mild and ignorable to intense and distinctly uncomfortable. Within the context of psychoactive substances, this effect can occur through tactile enhancement which increases the symptoms of a pre-existing condition which is usually otherwise not noticeable, as a result of muscle tension, as a result of kidney problems, and also as a symptom of withdrawal symptoms from substances which are used for pain relief such as opioids. Back pain is most commonly induced under the influence of heavy dosages of stimulating psychedelics compounds, such as LSD, 2C-B, and mescaline.