How is fibromyalgia diagnosed?
Fibromyalgia is a chronic health condition that involves
widespread pain throughout your body, tenderness in certain areas, and fatigue.
It can be difficult for your doctor to diagnose fibromyalgia. There are no lab
tests or imaging tests available for it. Instead, your doctor will ask you to describe
and rate your symptoms.
A number of other conditions can have similar symptoms as
- Lyme disease
- certain types of cancer
- degenerative diseases of the spine
Your doctor can use clinical tests to rule out many of these conditions. But
doing so takes a lot of time, effort, and money. According to the National Fibromyalgia and Chronic Pain Association,
it takes an estimated five years on average for a patient with fibromyalgia to
get a proper diagnosis.
are the diagnostic criteria for fibromyalgia?
In 2010, the American College of Rheumatology endorsed a new
set of criteria for diagnosing fibromyalgia. They published those criteria in
the journal Arthritis Care and Research.
According to those criteria, you have fibromyalgia if you meet the following
- You have a widespread pain index (WPI) score of seven
or higher and a symptom severity scale (SS) score of five or higher. Or
you have a WPI score of three to six and a SS score of nine or higher.
- You’ve experienced symptoms at a similar level for at
least three months.
- You don’t have another disorder that could explain your
Before these criteria were adopted, doctors used a “tender
point” system to diagnose fibromyalgia. Under the old system, you needed to have
widespread pain, as well tenderness when pressure was applied to at least 11
out of 18 points on your body.
Over time, experts realized that many doctors didn’t know
how to check for tender points or refused to do so. Plus, the older system
didn’t account for many symptoms that have since been recognized as key
features of fibromyalgia. For example, it didn’t address fatigue or depression.
Researchers believe the new system is better for diagnosing
do the widespread pain index and symptom severity scale measure?
Your doctor will likely use the widespread pain index (WPI)
and symptom severity scale (SS) to check you for signs of fibromyalgia.
They will use the WPI to check for a history of pain in 19
areas of your body. For each area where you’ve felt pain in the past seven
days, you will receive one point. Your doctor will add up all of your points
for a final score between 0 and 19.
They will use the SS to check for symptoms in four
categories unrelated to pain, including fatigue, cognitive problems, and other
possible signs of fibromyalgia. They will ask you to rate the severity of these
symptoms over the past week, on a scale from 0 to 3. Then they will add up all
of your points for a final score between 0 and 12.
You might have the disorder if you receive a:
- WPI score greater than 7 and SS score greater than 5
- WPI score between 3 and 6 and SS score greater than 9
To be diagnosed with fibromyalgia, you need to have
experienced symptoms at a similar level for at least three months. Your doctor
should also take steps to rule out other possible causes of your symptoms.
What are tender points?
The official diagnostic criteria for fibromyalgia no longer
requires a tender point examination. But your doctor might still check for 18
tender points associated with the disorder. Tender points feel painful when
only a small amount of pressure is applied.
To conduct a tender point exam, your doctor will press on 18
points on your body with their fingertip. They will use just enough pressure to
whiten their nail bed. Then they will ask if you feel any pain.
The locations of these points include:
- between your shoulder blades
- the tops of your shoulders
- the back of your head
- the front of your neck
- your upper chest
- your outer elbows
- your upper hips
- your inner knees
- the sides of your hips
will your doctor rule out other diseases?
Many conditions can cause symptoms similar to those of
fibromyalgia. Your doctor must rule out those conditions to make an accurate
diagnosis. To do this, they may use:
- blood tests to check for signs of HIV or AIDS,
hypothyroidism, rheumatoid arthritis, or Lyme disease
- X-rays, CT scans, or MRI scans to check for
signs of degenerative spinal diseases or certain kinds of cancer
- tissue samples to check for cancer
They may also order other tests, such as sleep studies or psychological
If you suspect you may have fibromyalgia, it’s a good idea
to keep a pain diary. Use it to track your daily experiences of pain, including
This will help your doctor get a full and accurate picture of your pain.
They will probably use the widespread pain index and symptom severity scale to
learn more about your symptoms. They may also check you for tender points.
Finally, it’s important for your doctor to rule out other possible causes of