Think of it as your personal army of cells, tissues, and organs, constantly patrolling for and kicking out invaders like viruses and bacteria. It's like a nightclub with a super-strict bouncer, constantly checking IDs and throwing out troublemakers before they cause a ruckus.

Even superheroes have off days! Stress, poor diet, lack of sleep, and certain medical conditions can weaken your defenses, making you more susceptible to illness.

Frequent infections, fatigue, slow wound healing, and unexplained weight loss are all red flags. But don't play doctor! Talk to your doctor for proper diagnosis and personalized advice.

Absolutely! Think of a healthy diet, regular exercise, and adequate sleep as your superhero boot camp. Fruits and veggies, regular workouts, and a good night's rest are the foundation of a strong immune system.