Fibromyalgia Symptoms HOME. Home âº Fibromyalgia Medication âº Gabapentin For Fibro. Fibromyalgia sufferers deal with myriad symptoms, not the least of which is pain. It is a chronic disorder that is characterized by ongoing widespread muscle pain and tenderness, and is usually accompanied by fatigue, insomnia, depression and anxiety.
In the lower thigh/above the back of the knee, the sciatic nerve divides into two nerves, the  tibial and peroneal nerves, which innervate different parts of the lower leg: Peroneal nerves. The peroneal nerves travel laterally (sideways) along the outer part of the knee and down into the upper foot.
The close approximation of the sciatic nerve is the reason that increased tone of the piriformis muscle could cause irritation to the sciatic nerve. Irritation to the sciatic nerve in patients with left psoas syndrome often causes pain that radiates down the back of the right leg and stops at the knee.