Chickenpox is a highly contagious viral infection marked by fever, tiredness, and an itchy red rash that turns into blisters. Early detection, home care, and vaccination help ensure faster recovery and prevent its spread.
Chickenpox is a contagious infection caused by a virus. It spreads very easily from one person to another, so anyone can get it. Children, unvaccinated people, and adults who never had chickenpox are at higher risk
The first signs of chickenpox are usually mild, such as fever, tiredness, and loss of appetite. After a day or two, an itchy red rash appears, often starting on the face and body.
Knowing these early signs helps protect yourself, your family, and pregnant women. Early care and vaccination make recovery easier and help stop the disease from spreading.
Chickenpox, also called varicella, is a contagious infection caused by the varicella-zoster virus.
Chickenpox can usually be diagnosed just by looking at the rash; in rare cases, tests may be done. The disease can be prevented with the chickenpox vaccine, given in one or two doses.
Many people confuse chickenpox with smallpox because both cause rashes. However, chickenpox is usually milder and less dangerous, while smallpox was far more severe and has been eradicated. Let’s look at the differences between the two.
Feature |
Chickenpox |
Smallpox |
Causes |
Varicella-zoster virus |
Variola virus |
Symptoms |
Fever, tiredness, loss of appetite, itchy red rash with small blisters |
High fever, body pain, painful rash with deep pustules |
Severity |
Usually mild in children; serious in adults, pregnant women, weak immunity |
Very severe, higher risk of death, deep scars |
Vaccination |
Prevented with varicella vaccine |
Had a vaccine; the disease was eradicated globally |
Contagiousness |
Spreads easily through coughs, sneezes, or contact with blisters |
Spread through close contact and respiratory droplets (eradicated now) |
Current Status |
Still occurs worldwide, mostly controlled with vaccination |
Completely eradicated since 1980 |
Chickenpox is caused by the varicella-zoster virus. It spreads in two main ways:
A person can spread the virus 1–2 days before the rash appears. They remain contagious until all blisters dry and form scabs.
Before the rash appears, a person may show:
In children, these signs are usually mild. In adults, they may be stronger.
Main Symptoms
In adults, the rash can be larger and last longer. They may also have a higher fever and body pain.
The rash goes through four main stages:
New spots may keep appearing for several days, so all stages can be seen on the body at the same time.
Symptoms usually appear 10–21 days after infection.
Most people recover with rest at home. See a doctor if:
Chickenpox usually starts with fever, tiredness, and loss of appetite. Soon after, an itchy rash appears. Knowing the early signs and stages helps in quick care. Vaccination protects both children and adults. You can also prevent chickenpox by avoiding contact with infected people and following good hygiene.
Yes. It spreads easily from one person to another.
Most marks fade with time, but dermatological treatments like creams or laser therapy may help.
Smallpox was much more severe. It caused deep scars and had a higher death rate, while chickenpox is milder and causes itchy blisters.
Yes, it can spread 1–2 days before the rash and until all blisters turn into scabs.
Most people recover within 7–10 days.
The best protection is the chickenpox vaccine and avoiding contact with infected people.
Yes, but it is usually very mild. Breakthrough cases may cause only a few red spots and low fever, and recovery is much quicker compared to unvaccinated cases.
Yes. If a pregnant woman gets chickenpox, it can cause serious complications such as pneumonia for the mother and congenital varicella syndrome for the baby. Pregnant women who are not immune should avoid contact with infected people.
Spicy, salty, and acidic foods may irritate mouth sores. It’s better to eat soft, bland foods like soups, rice, and yoghurt. Staying hydrated is equally important.
Most cases can be managed at home with rest, plenty of fluids, oatmeal baths for itching, and calamine lotion. However, medical advice is necessary if symptoms worsen.
Both cause rashes, but measles usually begins with a cough, runny nose, and red eyes, followed by a rash that starts on the face and spreads. Chickenpox rashes appear in crops and progress from red spots to blisters.
No. Scratching can lead to scarring and secondary bacterial infections. Keeping nails short and wearing gloves at night can help reduce scratching for children.
Not always. The varicella-zoster virus stays dormant in the body, and some people may develop shingles years later, but not everyone who has had chickenpox will.
Keep the child cool, dress them in loose cotton clothes, and use soothing lotions or oatmeal baths before bedtime. Antihistamines prescribed by a doctor may help reduce itching for better sleep.
Written and Verified by:
Dr. Sushil Kalra is the Director of Internal Medicine Dept. at CK Birla Hospital, Jaipur, with over 34 years of medical experience. He specializes in critical care, managing ICU and CCU patients, and acute medical conditions.
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