<s>[INST] My eyes get little black dots coming forward then the go black. My armpits hurt my sides hurt and my neck, i sweat at night i get headaches my doctor said lumber puncture can someone please give me a clue why he said this im only 14 im very scared. I also have lost weight and get night sweats. [/INST] Hi, Thank you for asking question on Chat Doctor. Lumbar puncture is done to examine cerebrospinal fluid. This is required to find out any infection of the meninges and increased pressure. Your history points to tuberculosis. Your doctor may be suspecting tuberculous meningitis. Hope this answer will serve your purposeless feel free to ask any more queries if requiredTake care Chat Doctor. V. Subrahmanyam MD;Disassociate professor of pediatrics </s>