You made it through flu season unscathed, but one morning you wake up with a nagging cough. Concerned it might be lingering seasonal flu, you cancel your plans at Planet Fitness, grab your bag, and head to urgent care. While it may seem like the flu, pneumonia often shares similar symptoms in the early stages. Pneumonia can strike anytime, affecting one or both lungs. It’s common and caused by bacteria, viruses, or fungi, with ...