<s>[INST] Hi, my daughter is 15 and is 20 pounds under weight  she recently has been very dizzy, and has been forgeting things. So her doctor sent us to get an EKG and it came back flat or something like that, so she has to go to a heart doctor in may. Can you please tell me what causes flat EKGs and diseases that she could have? [/INST] Hi There In your daughters case it must be a technical problem or a faulty machine because flat line in EKG represents absence of electrical cardiac activity which happens only after cardiac arrest or death. So it has to be a technical fault. She is probably not eating well and could be anemic also which could be reason of her dizziness. Also, this is the age of achieving monarch during which lot of hormonal changes happens in the body which can also make her feel low initially as body is adapting to new changes happening in the body. I wish her good luck </s>