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 ingots can be primarily obtained by Smelting (with the help of a Furnace) of iron ore found while mining. However, they can also be found in Temple, dungeon, and stronghold Chests. Rarely, Zombies will drop items made of iron, due to them wearing iron armor or holding an iron tool, or just the ingot itself.