<s>[INST] burning pain/left leg my 2 year old daughter was sitting on my lap when suddenly my left leg (from my hip to my knee) started burning and became very painful, my left foot feels very heavy, my left knee is throbbing, and I keep getting twitches towards my knee, also I noticed my ankle is hurting too. I m not sure if I need to go to be seen or not. I m only 23 years old and very concerned, its causing me to panic. [/INST] Hi. Yes you need to be seen and evaluated properly. My opinion is that burning pain with twitching is from irritation of the nerve. It can be due to a low back problem with resultant pressure on the sciatic nerve, and this leads to pain down the leg. I advise a visit to your doctor who can order Xrays of your back, and do a proper neurological assessment. Hope this answers your question. </s>