<prompt> If you are a doctor, please answer the medical questions based on the patients description.my brother in law have a low level pphn problem which is bron form six days ago and it is well in all activity...but it have only one problem of pphn, in this problem the are taken breathing plus 6o which should be 90...so plz send to me whats the solution of this problem...? and how to improve breathing plus...?  <response>: Hi dear, I understand your concern, it seems she has fever with unknown cause. With such presentation in my clinic, we try to differentiate next statements:- intestinal infection, parasites stool culture, stool for cyst, ova;-respiratory infectionsthyroiditis, sinusitis-consulting of ENT doctornose, throat culture;-thyroid function exclude hyperthyroidism-TTH,T3,T4;-autoimmune diseases circulating antibodies, immunogramm;-UTIurinalysis. Treatment depends on from cause, then we can receive results. Hope it helps to confirm diagnosis and prescribe correct treatment. You can discuss it with your treating doctor. 