<s>[INST] I have a sharp (like a needle going in) stabbing pain in the back of the foot near the heal. It just happens suddenly and it goes up the leg and ends around back of knee. It started 2 nights ago and is getting worse. It happens when I am walking, sitting or lying down. [/INST] Hello, Thanks for writing to us, I have studied your case.There is possibility of plantar fascitis.Shoe/footwear should be with soft sole. You can use silicon pad insoles.You should not walk bare foot at home also.Avoid exposure of cold to foot.Start plantar exercises consulting physiotherapist also Physiotherapy like TENS and ultrasound will help. Some times tapping to foot may also help to relieve pain.Take calcium supplement with vit D.If no relief with this line of treatment then local injection shot can give pain relief for longer duration.Last modality is minimally invasive surgery to release inflamed tissue. You can do plantar fascia release arthroscopic ally.Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries. Wishing you good health.Take care. </s>