Planter fasciitis is the most common cause of arc pain of foot bt there are some other causes also like PTTD, cavus foot ,etc . u need to visit an orthopaedition or physiotherapist for proper diagnosis and treatment.
Next Steps
Take rest
apply ice therapy
Foot stretches can also help to relieve pain.
use silicon heel pads in shoes for extra comfort.
Health Tips
Avoid weight training and strenuous activities for few days.