From the MEA information leaflet on headaches and ME/CFS:
What causes headaches in ME/CFS?
The simple answer is that we just don’t know. Although various abnormalities relating to brain and nervous system function have been reported in the research literature, none of them provide a satisfactory explanation as to why some people with ME/CFS have headaches, and others do not.
What we do know from research is that there is a link between ME/CFS and migraine-type headaches (reference 1). And where migraines or migraine-type headaches occur, this will influence the choice of drugs that might be used to both treat and prevent headaches occurring.
There is also a link between ME/CFS and temperomandibular joint (TMJ) disorders (reference 2) – where the joint between the lower jaw and base of the skull causes various types of facial pain. About 20% of people with TMJ disorders have headaches. If you suspect that you may have a TMJ problem, the best person to talk to is your dentist.
There has also been some research published from a neurology group at Addenbrooke’s Hospital in Cambridge (reference 3) which indicates that an unknown, but possibly substantial minority of patients with ME/CFS have what is called idiopathic intracranial hypertension.
When to see your doctor
If you have headaches at the start of your ME/CFS, this should always form part of the initial clinical assessment in the consulting room. The doctor should ask about the location of the pain, severity, duration, exacerbating factors (e.g coughing, sneezing, exercising, change in posture, menstruation) and relieving factors – all of which will help to decide whether there is any need to investigate further and what sort of drug treatment is most likely to help.
If there are any other symptoms or signs suggesting that there could be another more serious explanation for your headaches the doctor will arrange further tests, or refer you to a neurologist, or to a headache clinic at the hospital.
If headaches appear after ME/CFS has been diagnosed as a ‘new symptom’, this should always be discussed with your GP before you start self-treating with over-the-counter (OTC) painkilling drugs.
Red flag symptoms and signs
There are a number of ‘red flag’ symptoms and signs which indicate that a headache may have a more serious cause. If any of these symptoms occur you must see your doctor for further advice:
· Sudden severe headache
· Red eye and haloes around lights – acute glaucoma
· Neurological symptoms or signs
· Co-inciding with other new symptoms or signs
Headaches in children
Headaches can also occur in children and adolescents with ME/CFS. Again, it’s important to check with your doctor who will want to ask about:
· Where they occur
· How often they occur
· What makes them better (e.g sleep) or worse (e.g food, periods, stress)
· Are there any associated symptoms?
· Are headaches reported at school?
If a child has a more severe or sudden headache, or persisting headaches, other explanations must be considered. Red light symptoms, where you must check with a doctor, include:
· Photophobia – sensitive to bright lights
· Neck stiffness
· Fever
· Non blanching skin rash
· Weakness of arm or leg
· Changes in conscious level or behavior
Any headache that is accompanied by photophobia, neck stiffness or a rash could be due to meningitis – which is a medical emergency.
Dr Charles Shepherd
Hon Medical Adviser, MEA