So, you have pain on the bottom of your feet, and you were diagnosed with plantar fasciitis. When you try to explain this to someone, all you can remember is that it's called "plantar- something." Well, I can help you with this; the words can be broken down easily to explain the condition. Plantar means bottom of the foot. Fascia is fibrous tissue that supports muscle and skin. The suffix, -itis, means inflammation. Put them all together (after you drop the "a" from fascia) and you have a word that is also a diagnosis, inflammation of the supporting tissue on the bottom of the foot. Easy, right? Easy, perhaps, if you don't suffer from the condition. Plantar fasciitis is very painful and it can take a long time to heal.