Chronic pain syndrome affecting muscles and soft tissue is known as:

Fibromyalgia is characterized by widespread chronic pain affecting muscles and soft tissues, along with additional symptoms such as fatigue, sleep disturbances, and often, cognitive difficulties, commonly referred to as "fibro fog." It is believed to involve an increased sensitivity to pain signals in the brain and nervous system, leading to an amplified perception of pain.

The condition itself does not stem from inflammation or damage to tissues but instead is associated with how the brain processes pain signals. As a result, individuals with fibromyalgia may experience pain in multiple areas of the body without any clear physical source.

While other conditions such as myofascial pain syndrome also involve pain in the muscles and soft tissues, fibromyalgia encompasses a broader range of symptoms and affects multiple sites rather than being localized to specific trigger points. In contrast, arthritis primarily refers to inflammation of the joints, and neuropathy relates to nerve pain resulting from various causes, neither of which captures the comprehensive nature of the defined chronic pain syndrome seen in fibromyalgia.