Left foot pain at the bottom of my foot in the arch?

Inflammation: This most likely would be plantar fasciitis or a flexor tendonitis. There is also the possiblity of a pinched nerve to the area. The only way to find out for sure is to visit your podiatrist.

Several things: Depending on where exactly your pain is and when you have pain, there may be tendon involvement or just plantar fasciitis. You need to see a podiatrist to evaluate you.

Many possibilities: Heel pain is most often caused by plantar fasciitis, a condition that is sometimes also called heel spur syndrome when a spur is present. Heel pain may also be due to other causes, such as infection, tendonitis, arthritis, stress fracture, nerve irritation, retained foreign body, bone tumor, or a cyst. Have it evaluated by a professional and get the appropriate treatment.