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Cortisone shots can be helpful for a variety of running injuries, including plantar fasciitis. Some runners, and some health professionals, caution against this because of the risk of fat pad atrophy. But a good podiatrist can do this shot with minimal discomfort, and it just might help.
It's still important to keep up with icing and stretching of the calf, and wearing supportive, comfortable shoes helps, too. And rest (relatively, which for some runners means fewer hills and less mileage) can't hurt.
But don't rule out cortisone out of fear or horror stories that you read elsewhere online. Just make sure you get your shot from an experienced podiatrist.