The present disclosure provides methods and systems for diagnosing and treating fibromyalgia in a patient. In one method, a pressure value is obtained for the patient, wherein the pressure value is determined by inserting a needle of a device into a location in the patient, injecting saline solution into the patient at the location, and measuring a pressure at the location: and fibromyalgia is diagnosed in the patient if the pressure at the location exceeds a threshold pressure value. The present disclosure also provides a device for use in the methods of the disclosure. One such device includes a needle, a syringe including a saline solution, a tube positioned between the syringe and the needle, and a pressure sensor configured to obtain a pressure value at a muscle location of a patient.
