Hi welcome to healthcare magic,
is the most commonest cause of Hematuria
i.e bloodstained urine.In very few children it progresses to nephritis
. Yes children who develop nephritis can have hypertension
too . Treatment is just symptomatic i.e salt restriction , taking drugs to control hypertension and a regular check up to see the functioning of kidneys. There is no permanant cure though it can be controlled .Yeah there has been reported data that fish oils offer some benefit .