Sometimes you think you do but even health professionals often get it wrong. It could be other things. This video goes through how to diagnose plantar fasciitis/fasciosis as well as some of the more common differential diagnoses. This video doesn't cover every possibility such as a motor's neuroma, fracture, etc. It does cover fasciosis, neuropathy, tendinopathy, myofascial trigger points, and joint pain. This video does discuss the self treatment to myofascial trigger points but does not discuss in any great detail the treatments of the other covered pathologies.