 [ Symptoms ] i have been achy all over weak and out of breath for 6 weeks i feel feverish but no fever is this likely to be a virus  no sore throat no cough or cold clear chest x ray nothing odd popping up on bloodwork negative lyme ana esr i have had no improvement or change with symptoms for 6 weeks now going crazy doctors do not know what is wrong with me what else should i do to help diagnose this  if this is a virus is it normal to last 6 weeks with no improvement  is it okay to run errands or should i just stay in bed for a week to get over this  thanks  jenny [ Disease ] a tumor is an abnormal mass of tissue that is formed by an abnormal accumulation of cells normally the cells in your body age die and are replaced by new cells with cancer and other tumors something disrupts this cycle new cells are made when they are not needed and old cells do not die as this process goes on the tumor continues to grow as more and more cells are added to the mass primary brain tumors emerge from the various cells that make up the brain and central nervous system and are named for the kind of cell in which they first form the most common types of adult brain tumors are gliomas or astrocytic tumors these tumors form from astrocytes and other types of glial cells which are cells that help keep nerves healthy the second most common types of adult brain tumors are meningeal tumors these form in the meninges the thin layer of tissue that lines the brain and spinal cord and can grow from a number of different kinds of brain and spinal cord cells