<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a pulsating in my left calf that has been coming and going for about a month. It seems to be gradually becoming more frequent and intense, and has been pulsating very frequently for the last 5 hours. There is no pain, but i awoke twice during the night and felt a severe pins and needles sensation in my left hand and foot. for a little background medical info, 4 years agoI tore the same calf muscle, but it was first suspected to be a blood clot because of the swelling. What could this pulsating feeling in my left calf be?  <response>: Hello! Welcome on Chat Doctor! Regarding your concern, I would explain that your symptoms could be related to a deep vein thrombosis or inflammation. But the fact that you have felt pins and needles in your left limbs, could be a sign of a TIA transient ischemic attack. For this reason, I recommend going to the ER for a careful physical exam and some tests: - a Doppler ultrasound of the leg vessels- a cardiac ultrasound- a resting ECG-complete blood count, PCR, ESR for inflammation- blood electrolytes. A brain MRI may be needed to investigate for a TIA. You should discuss with your doctor on the above issues. Hope you will find this answer helpful! Wishing good health, Chat Doctor. 