This document summarizes common diseases in children including adenoids, the common cold, and whooping cough. Adenoids are an enlargement of the pharyngeal tonsils that can cause breathing difficulties and ear problems. The common cold is a viral infection that can lead to more serious conditions if neglected, with symptoms like sneezing and fever. Whooping cough is a communicable disease spread through coughing that causes throat pain and coughing fits. Prevention methods include isolation, rest, and handwashing.