Is the cold caused by viruses or weather changes (el nino condition here now). i caught it quite often recently. always starting with a sore throat painful radiate to ear>cough>runny itchy sneezy clog nose. only 2-3 weeks recovered but caught again?

There are about 200 viruses that cause the common cold. You obviously aren't immune to all of them. We were always taught that being out in the cold or a rainy day does not predispose one to catching a cold, but recent research suggests that when the nasal membrane gets cold, ability to ward of head colds is impaired. Try taking Vit C to boost your resistance to catching a cold.