Most Common Chronic Diseases: Types, Risks and Prevention

Most Common Chronic Diseases: Types, Risks and Prevention

The most common chronic diseases are heart disease and stroke, cancer, diabetes, chronic lung disease, kidney disease, dementia and depression. In the United States, three in four adults have at least one chronic condition, and most of these diseases share the same handful of risk factors, so the steps that lower one risk usually lower the others too.

This guide is for anyone who wants a clear map of long-term health conditions: what they are, which ones stay silent, and where to start if you want to cut your risk.

Key takeaways

  • The CDC describes a chronic disease as a condition that lasts one year or more and needs ongoing medical attention, limits daily activities, or both.
  • Three in four American adults have at least one chronic condition, and over half have two or more, according to the CDC.
  • Worldwide, noncommunicable diseases killed at least 43 million people in 2021, about 75% of deaths not related to the pandemic, according to the World Health Organization.
  • Smoking, poor nutrition, physical inactivity and excessive alcohol use are the main behaviors behind many preventable chronic diseases.
  • Several common conditions, such as high blood pressure and type 2 diabetes, often go undetected, so routine checks matter more than waiting for symptoms.

What counts as a chronic disease?

A chronic disease is a health condition that lasts a year or longer and either needs ongoing medical care or limits your daily life. That's the broad definition the Centers for Disease Control and Prevention uses.

The opposite is an acute illness, which comes on quickly and usually resolves, like a cold, a sprain or a stomach bug. Chronic conditions tend to develop slowly, often over years, and they're usually managed rather than cured. You'll also see the term noncommunicable disease (NCD). It means a disease that doesn't spread from person to person, and global health agencies use it to group heart disease, cancer, chronic lung disease and diabetes together.

Another useful term is multimorbidity, which simply means living with two or more chronic conditions at once. It's common: the CDC reports that over half of American adults are in this group. That matters because conditions feed each other. High blood pressure raises the risk of heart disease and stroke, diabetes affects the kidneys and blood vessels, and long-term illness of any kind can wear down mental health.

What are the most common chronic diseases?

The conditions that affect the most people, and cause the most deaths and disability, are cardiovascular disease, cancer, diabetes, chronic respiratory disease, chronic kidney disease, dementia and depression. The table below sums up each one.

ConditionPlain definitionOften silent early on?Where to read more
High blood pressureBlood pushing too hard against artery walls over timeYes, many people don't know they have itOur guide to blood pressure numbers
Heart disease and strokeDamage to the heart or the blood vessels feeding the heart and brainOften, until a heart attack or strokeHeart Health posts
Type 2 diabetesBlood sugar stays too high because the body doesn't use insulin wellYes, a large share of cases are undiagnosedOur early signs of diabetes guide
CancerAbnormal cells that grow and spread out of controlSome types, which is why screening existsOur cancer risk guide
Chronic lung diseaseLong-term breathing conditions, such as chronic obstructive pulmonary disease and asthmaSymptoms often build slowlyTalk to your doctor about breathing tests
Chronic kidney diseaseKidneys gradually lose their ability to filter bloodOften, in early stagesOur kidney habits guide
DementiaA decline in memory and thinking that interferes with daily lifeEarly changes are easy to missOur dementia guide
DepressionA persistent low mood and loss of interest lasting weeks or longerOften hidden or dismissed as stressOur depression guide

On a global scale, the World Health Organization reports that in 2021 cardiovascular diseases caused at least 19 million deaths, cancers 10 million, chronic respiratory diseases 4 million, and diabetes over 2 million, including kidney disease deaths caused by diabetes. Those four groups account for 80% of premature NCD deaths.

Why do so many chronic diseases go unnoticed?

Many chronic diseases cause no obvious symptoms for years, so the only way to catch them early is a measurement: a blood pressure reading, a blood test or a screening exam. By the time you feel something, the condition has often been there a while.

High blood pressure is the clearest example. The CDC estimates that nearly half of U.S. adults (48.1%) have high blood pressure, about 1 in 6 adults with it are unaware of it, and only about 1 in 4 have it under control. If you want to understand what your reading means, our explainer on what blood pressure numbers mean and what to do about them walks through each category.

Diabetes follows the same pattern. According to the CDC National Diabetes Statistics Report, 40.1 million people in the U.S. have diabetes, and 11.0 million of them, 27.6% of adults with diabetes, haven't been diagnosed. Another 115.2 million adults have prediabetes, which means blood sugar is higher than normal but not yet in the diabetes range. Our list of early diabetes warning signs you shouldn't ignore covers what to watch for, and if your results came back high even though you eat well and exercise, read about why prediabetes can show up despite a healthy lifestyle.

What causes most chronic diseases?

Most common chronic diseases are driven by a short list of shared risk factors: tobacco, unhealthy diet, physical inactivity, excess alcohol and, increasingly, air pollution. Genetics and age matter too, but they set the starting line rather than the whole race.

The CDC names smoking, poor nutrition, physical inactivity and excessive alcohol use as the key behaviors behind many preventable chronic diseases. The WHO adds air pollution to the list and singles out high blood pressure as the leading metabolic risk factor, linked to 25% of global NCD deaths.

That overlap is good news: you don't need a separate plan for every disease. Our guide on habits and vaccines that lower cancer risk shows how much of that advice lines up with heart and metabolic health.

Risk factors you can't change still matter, because they tell you how closely to watch. These include age, family history, and some inherited conditions. If a parent or sibling had early heart disease, diabetes or a particular cancer, tell your doctor. It can change when screening should start.

How can you lower your risk of chronic disease?

Focus on the few shared risk factors first, then add regular checks so silent conditions get caught early.

Use this checklist as a starting point:

  1. Don't smoke, and get help to quit if you do. Tobacco is named as a leading risk factor by both the CDC and the WHO.
  2. Move most days. Physical inactivity is one of the four main behaviors linked to preventable chronic disease. Walking counts.
  3. Eat mostly whole foods. Build meals around vegetables, fruit, beans, whole grains and unprocessed proteins, and cut back on heavily processed foods and added salt.
  4. Keep alcohol low. Excessive alcohol use is on the CDC list, and less is better for long-term health.
  5. Know your numbers. Get your blood pressure checked and ask whether you're due for blood sugar, cholesterol and kidney tests.
  6. Stay on top of screenings. Ask which cancer screenings fit your age, sex and family history.
  7. Look after your mood and sleep. Ongoing low mood is a health condition, not a character flaw, and it deserves care.

Your kidneys are a good example of how this works in practice. Most of the advice in our post on simple habits that keep your kidneys healthy overlaps with blood pressure and blood sugar control.

How do chronic diseases affect the brain and mental health?

Chronic disease isn't only about the heart, lungs and metabolism. Dementia and depression are both long-term conditions, and they often appear alongside physical illness.

Dementia is an umbrella term for a decline in memory, thinking and reasoning that's serious enough to interfere with daily life. It has several types. Our guide to dementia types, stages and ways to lower your risk explains the differences.

Depression is more than a bad week, and it can make it harder to keep up with medicines, meals and exercise. If that sounds familiar, read about depression symptoms, treatment and how to get help.

Common mistakes people make with chronic disease

A few patterns come up again and again, and each one delays care.

  • Waiting for symptoms. As the blood pressure and diabetes figures above show, many people with these conditions don't know they have them.
  • Treating each condition in isolation. If you have more than one, ask your doctor how the treatments fit together, and keep one up-to-date list of every medicine and supplement you take.
  • Stopping treatment once numbers look good. A normal reading on treatment often means the treatment is working, not that you no longer need it. Talk to your doctor before changing anything.
  • Assuming it only affects older people. Risk rises with age, but the habits that drive chronic disease start early, and the WHO reports about 18 million NCD deaths occurred before age 70 in 2021.

When to see a doctor

See a doctor for a routine check if you haven't had your blood pressure, blood sugar and other basic tests in a while, if chronic disease runs in your family, or if you've noticed slow changes in energy, weight, thirst, breathing, mood or memory.

Some symptoms are emergencies. Call 911 or your local emergency number right away for:

  • Possible heart attack signs, which the CDC lists as chest pain or discomfort; feeling weak, light-headed or faint; pain or discomfort in the jaw, neck or back; pain or discomfort in one or both arms or shoulders; and shortness of breath.
  • Possible stroke signs, which the CDC lists as sudden numbness or weakness in the face, arm or leg, especially on one side; sudden confusion or trouble speaking; sudden trouble seeing; sudden trouble walking, dizziness or loss of balance; and a sudden severe headache with no known cause.

For a suspected stroke, the CDC advises calling for an ambulance rather than driving, so treatment can begin on the way, and noting the time symptoms started.

FAQ

What is the number one chronic disease?

Measured by deaths, cardiovascular disease is the biggest. The WHO reports at least 19 million cardiovascular deaths worldwide in 2021, far more than any other noncommunicable disease group. In the United States, heart disease, cancer and diabetes are among the leading causes of death and disability. High blood pressure, a major driver of heart disease and stroke, affects nearly half of U.S. adults.

Can chronic diseases be cured?

Most chronic diseases are managed rather than cured, which is part of what makes them chronic. That said, the CDC reports that only about 1 in 4 adults with high blood pressure has it under control, which shows how much room there is to do better with ongoing care. Ask your doctor what a realistic goal looks like for you.

Are chronic diseases genetic?

Genes play a part, but they're rarely the whole story. Family history can raise your risk of heart disease, diabetes and some cancers, and it may mean you need earlier or more frequent checks. Still, the CDC and WHO point to smoking, diet, inactivity, alcohol and air pollution as major drivers, and those are things you can change.

How many people have more than one chronic disease?

It's very common. The CDC reports that over half of American adults have two or more chronic conditions. Conditions often travel together because they share risk factors and affect each other. For example, high blood pressure raises the risk of heart disease and stroke. If you manage several conditions, ask for one coordinated plan and keep a single medicine list.

What to do next

  • Book a check-up and ask for your blood pressure, blood sugar and cholesterol results in writing so you can track them.
  • Write down your family history of heart disease, diabetes, cancer and dementia, and share it with your doctor.
  • Pick one shared risk factor to work on this month, such as daily walking or cutting back on alcohol.
  • Learn the heart attack and stroke warning signs listed above, and make sure people in your household know them too.

This article is for general information and is not medical advice. Talk to a qualified health professional about your own health, tests and treatment.

Sources

Last reviewed: October 2026.

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