<s>[INST] I have been having a problem with passing out all year ive passed out four four times and have experiances pre-syncope twice within the first nine weeks. Is it possible to have a low grade viruse and feel bad with out having a fever or is there something else going on here? [/INST] Hi, I had gone through your question and understand your concerns. More probable cause of your concern may be postural hypotension (lowering of blood pressure changing the body position from laying to standing). There is need to measure blood pressure on laying, sitting and standing positions. If there is a 20 mmHg change of blood pressure, postural hypotension is diagnosed. Treatment consists initially on avoiding extreme fatigue, hot places (strong sun), alcohol consumption and good fluids intake during all day. If symptoms persist you need to consult your primary care Doctor and discuss your concerns. Hope this helped. If you have further questions feel free to ask. </s>