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.
This list assumes you are playing the Vanilla version of Minecraft, with no mods installed. Tools Which is to say, a pickaxe first. Your Iron pickaxe will be your friend deep underground, when you find a rare ore to mine such as gold or, dare I say, diamond. BUT, you generally only need one pickaxe made of iron for those rare ores, especially when you have a low number of ingots. An iron sword is also a major improvement over the stone sword, and if you find yourself troubled by monsters frequently, it could be a worthwhile investment. Don't waste the iron on axes, hoes, or shovels though.