What is causing the pain in his heel?

My husband is a healthy 40 year old man. He’s 5’10, 250 lbs. He’s done hardwood flooring for ten years, used to build cell-phone towers, and has pretty much always been in construction.

Recently, he’s been experiencing a sharp pain in the heel of his right foot. It hurts in the entire heel, but is worst in the center, just below the arch. The pain comes in waves, and at its worst rates between a 6 and 7.

The pain is worse at the end of the day, and resting (when he can get it) helps somewhat. Sometimes it gets so bad he can barely walk.

Since we don’t have health insurance, he’s let this go for as long as he could – but it’s becoming unbearable.

We are hoping to get an idea as to what could be causing the pain, in hopes of keeping the diagnostic costs down.

Any help? Thanks!