Nature's Eye

Overview
An enlarged heart (cardiomegaly) isn't a disease, but rather a sign of another condition.
The term "cardiomegaly" refers to an enlarged heart seen on any imaging test, including a chest X-ray. Other tests are then needed to diagnose the condition that's causing the enlarged heart....

When you have diarrhea and vomiting, you may say you have the "stomach flu." These symptoms often are due to a condition called gastroenteritis.
With gastroenteritis, your stomach and intestines are irritated and inflamed. The cause is typically a viral or bacterial infection....

 Gianotti-Crosti syndrome is a rash that usually affects young children. It's sometimes called papular acrodermatitis of childhood. The rash covers the arms, legs, and face. It can cause itching and discomfort.
Gianotti-Crosti is usually a delayed immune reaction to a virus. The rash will appear as your child is recovering from an illness such as a respiratory infection or stomach virus. It's very common and doesn't have lasting effects, but it can be alarming...

Immune system
The immune system is made up of a complex network of organs, cells, and proteins that fight infection (microbes).
Image Credit: freepik