 [ Symptoms ] why does my skin itch when i sweat  it seems that my arms under my neck my side and behind my knees itch extremely bad to the point where when i itch it tears the skin i just want to know what might be causing it [ Disease ] hello i have been through your same problems it is not a comfortable situation when i had this problem i went to my family md first he did a urine test well this was all it took to figure out that i had a very bad bladder infection bladder infections can cause nausea back pain leakage burning when you urinate and some pelvic pain in my opinion i would go see my dr but until you can get into the dr i would not drink any sodas any caffine alcohol or anything with high acid  things like oj drink lots of water but i would go to the store and get some cranberry juice or in the pharmacy in the vitamins section there is a cranberry pill that is a very high concentrated cranberry oil which helps to clean your urinary tract one of these the juice or the pills will help you out a lot just follow the instuctions on the back of the bottle of pills or if you are going to drink the juice i would drink 4 6 ounces 4 times a day until you see the dr info from someone who has been through this i take cranberry pills everyday now i have not had as many problems with this anymore and i strated taking the pills this about 3 years ago if you do start this make sure to talk to your dr about it when you see him for your appointment good luck to you i hope this helps you and anyone else that may read this god bless