A friend has pain all over body what can it be?

Fibromyalgia? You give little information, but the first thing that comes to mind is fibromyalgia. Read about it online and whether or not the picture fits, you have proved yourself a true friend by asking on their behalf.
Maybe fibromyalgia. Fibromyalgia may be the reason. Other things can do it so your friend needs to be evaluated. Fibromyalgia is a chronic pain syndrome and one of the hallmark symptoms is pain all over. These symptoms need to be clarified and since other conditions can cause this and an evaluation is necessary.