Are there some genetic reasons i get fibromyalgia off and on?

Possibly: There may be a genetic predisposition as there is clustering of cases in families (aggregation). Stress may activate it. It is more common in women, 9 to 1. If an identical twin has it there is 15% chance the other one will develop it as well. The inheritance likely involves many genes, typically those involving dopamine, serotonin, or norepinephrine.

Dom't know: But in general. Almost every illness humans can get has some genetic component.

JHS: Genetic relationship of fibromyalgia (fm) explained by joint hypermobility syndrome (jhs) which has known genetic relationships. British clinicians well acquainted with concurrent occurrence of jhs & fm. Garden variety jhs is common & females with this variation able to oppose & touch thumb to forearm, hyperextended elbows, lock knees & touch palms to floor & were able to back bridge as children.