Chickenpox is caused by the varicella zoster virus, which spreads mainly through droplets in the air when an infected person coughs or sneezes, and by direct contact with blister fluid. After the first infection, the virus stays in the body for life and can later reactivate as shingles.
Chickenpox is most common in children, especially in group settings like daycare and school. The highest risk of severe disease and complications is in infants, adults, pregnant women without immunity, and people with weakened immune systems.
In healthy children, chickenpox is usually treated at home with rest, fluids, fever reducers like paracetamol, and anti-itch measures such as soothing lotions and antihistamines. High‑risk patients (pregnant women without immunity, adults, and people with weak immune systems) may need antiviral medicines like acyclovir and sometimes hospital care. Avoid scratching, keep nails short, and never give aspirin to children with chickenpox.