What does USP stand for? What does USP mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: USP.
Anytime a person with lower back pain and fever complains of a stiff neck, meningitis must be considered, especially in children. Meningitis is an infection of the tissue that covers the brain and spinal cord. It may cause upper back pain, stiff neck, swollen lymph nodes, and fever.
Your doctor will use these symptoms to help determine whatâs causing your stiff muscles. It could be one of the following conditions: 1  acute HIV infection. 2  rhabdomyolysis (a condition that breaks down your muscles). 3  overuse syndromes. 4  coccidiomyocosis (also known as valley fever or California fever).