i keep having pain in my lower back. It is usually after i walk in heels or jog. Sometimes it even makes it hard to lean over put socks on or tie my shoes. its like a constant ache...that comes and goes constantly after certain activities. I'm not old I'm just 20. It started in december as just once..then it has progressively gotetn worse...I plan on seeing the dr soon..but do you have any idea what sort of problem i'm looking to?