from the Mayo Clinic:

Fibromyalgia is a long-term condition that involves widespread body pain. The pain happens along with fatigue. It also can involve issues with sleep, memory and mood. Researchers think that fibromyalgia affects the way the brain and spinal cord process painful and nonpainful signals. That increases your overall sensitivity to pain.

Symptoms often start after a triggering event. Triggers can include injuries, surgery, infections or emotional stress. Or the symptoms can build up over time, with no single event to trigger them.

There's no cure for fibromyalgia. But medicines and other treatments can help control the symptoms. Exercise, talk therapy and techniques that lower stress also may help.

The main symptoms of fibromyalgia include:

• Widespread pain. Fibromyalgia pain often is described as a constant dull ache that has lasted for at least three months. The pain is considered widespread if it happens on both sides of the body and above and below the waist.
• Fatigue. People with fibromyalgia often wake up tired, even though they say they sleep for a long time. Often, the pain disrupts sleep. Many people with fibromyalgia have other sleep disorders. These include restless legs syndrome and sleep apnea.
• Thinking-related troubles. A symptom known as "fibro fog" makes it harder to pay attention and focus on mental tasks.

With fibromyalgia, many researchers think nerves are affected in a way that causes the brain and spinal cord to change. This change involves an irregular rise in levels of certain chemicals in the brain that signal pain.

In addition, the brain's pain receptors seem to develop a sort of memory of the pain. They can start to overreact to painful and nonpainful signals.

Many factors likely lead to these changes, including:

• Genes. Fibromyalgia tends to run in families. So certain gene changes might make you more likely to get the condition.
• Infections. Some illnesses appear to trigger fibromyalgia or make it worse.
• Physical or emotional events. Sometimes, fibromyalgia can be triggered by a physical event, such as a car accident. Ongoing stress also may trigger the condition.

for more information from the Mayo Clinic, visit their website on Fibromyalgia at:

https://www.mayoclinic.org/diseases-conditions/fibromyalgia/symptoms-causes/syc-20354780