For most people with a herniated disk, low back pain is the initial symptom. This pain may last for a few days, then improve. It is often followed by the eventual onset of leg pain, numbness, or weakness. This leg pain typically extends below the knee, and often into the foot and ankle.
Iron Nuggets are used for crafting very basic thaumaturgic tools, including your very first wand. Besides crafting, they can be produced as bonus material by the Infernal Furnace.
Iron Bars are bars smelted with two Iron Ores at a Furnace. They are used to craft various early-game items, including the Iron Anvil, Weapons and each of the races' own Armor sets. They are a material used in the creation of Steel Bars.