My podiatrist recommends a cortisone shot for my plantar fasciitis after 4 weeks and 2 weeks on naids. are cortisone shots safe or should i continue with stretching?

Stretching: I would personally exhaust all other treatments before doing that. Stretching especially overnight is crucial to get plantar fasciitis under control (even if you decide to get the shot). Have you been working with a physical therapist? If not consider doing so. Hope you get some relief soon.

Avoid them: I would suggest avoiding cortisone shots for this issue. Cortisone liquifies fats and a misplaced injection can damage the fat that forms your heel pad. Stay with stretching and try orthotics. Plantar fasciitis take 3-6 months to resolve.

Cortisone is safe: The amount of cortisone that will be injected is insignificant and is really the gold standard in reducing symptoms from plantar fasciitis. Four weeks is long enough to wait before injection . Continue stretching nd use ice. Make sure you are wearing supportive foot gear.

Think: The advice you have been given is good. I inject then another spaced 2weeks later. I have found this to be extremely helpful in reducing symptoms.