Foot Pain near the big toe can have a number of different causes, the most likely are hallux limitus and rigidus which are essentially the jamming of the big toe against the foot that leads to inflammation and pain.
The next most likely is a bunion if the forms a big bump on the inside of the foot as well as decreasing motion within the join.
Suspect gout as the cause for foot pain near the big toe if the joint is extremely red hot and swollen without any injury or cause.
If the area underneath the toe is sore especially after a great deal of running, suspect a sesamoid fracture or sesamoiditis.
Good Luck with your Foot Pain Near Big Toe!