For 3 days my throat has been sore on left side. No other symptoms. No tonsils. Hurts especially to look up or stretch that part of my throat/neck.?

Multiple Causes. There could be multiple causes for having throat discomfort, but the most likely cause is a viral illness. You should see her family practice physician to make sure. Most viruses will get better after 7-10 days. If symptoms continue, make appointment with your physician.