Cold and cough are caused as either the immunological response of the body against a foreign body which enters or irritates the respiratory tract or caused by viral infections. the reason for cold attacks when the climate changes occur is that the viruses and the irritants like pollens are maximum in the atmosphere in cold damp climate. there are many effective home remedies for cold. Decoction made of tulasi leaves, black pepper, pudina leaves, dry ginger, turmeric and jaggery can be taken twice a day during the climate change.