Pain

Pain occurs in a wide range of forms in ME/CFS. These include:
 * abdominal pain
 * allodynia
 * arthralgia (joint pain)
 * carpal tunnel syndrome
 * chest pain
 * chronic pain
 * ear pain
 * esophageal spasms
 * eye pain
 * fibromyalgia
 * gallbladder pain
 * headaches
 * heartburn
 * hyperalgesia
 * migraine
 * muscle spasms
 * myalgia (muscle pain)
 * neck pain
 * proctalgia fugax
 * sciatica
 * sinus headache
 * vein pain, and
 * tenesmus.

Pain can also occur as a consequence of common comorbid illnesses such as endometriosis, Sj%C3%B6gren's syndrome, IBS or fibromyalgia.

Symptom recognition

 * In the Canadian Consensus Criteria, pain is a required criteria for diagnosis. It requires that "there is a significant degree of myalgia. Pain can be experienced in the muscles, and/or joints, and is often widespread and migratory in nature. Often there are significant headaches of new type, pattern or severity."