What is chronic pain, and how long must pain last to count?
CDC calls its three-month cutoff an approximate guide, and other agencies word the line a little differently. A fair question for a care team is how your own pain has behaved over time.
Arun Verma, co-founder of Triangle · 2026-10-17
This is not clinical evidence and not medical advice. It does not replace your care team. Discuss anything here with your clinician before you act on it.
What is chronic pain?
Chronic pain is pain that lasts longer than three months, or longer than the time it should take to heal. It can be present most days or every day, and it may last for weeks, months or even years. NINDS says it can happen without a known cause and can persist after an injury or known cause has resolved. It can make it harder to do necessary tasks, work and enjoy activities.
How long does pain have to last to count as chronic?
About three months is the usual line. CDC's 2022 clinical guideline defines acute pain as lasting less than one month, subacute pain as one to three months and chronic pain as more than three months, and says these time-bound definitions are approximate guides, not absolutes, because pain often gradually transitions from acute to chronic. The wording varies a little. NCCIH says chronic pain is variously defined as 3 to 6 months, but longer than "normal healing". For back pain, NIAMS describes chronic back pain as lasting longer than 12 weeks and occurring daily.
How is chronic pain different from acute pain?
Acute pain starts suddenly and ends when its cause is treated or healed, while chronic pain goes on past that point. The feeling of acute pain is usually sharp because it tends to act as a warning signal about a threat to the body, and strained muscles and broken bones are among the common causes. Sometimes an acute pain condition might persist and become chronic. In other cases chronic pain happens for no known reason. NINDS notes that a person can have chronic and acute pain at the same time.
Which forms of chronic pain come up?
Three forms are covered here: back pain, migraine and nerve pain. In a national survey NCCIH cites, low-back pain was among the most frequent diagnosed conditions in people with chronic pain, and migraine was among the other common ones. Back pain can range from a dull, constant ache to a sudden, sharp pain that may shoot down the leg, according to NIAMS. Migraine is a health condition that is more than a bad headache, with headaches that keep coming back and often other symptoms, and chronic migraine means headaches on at least 15 days of the month for more than three months, per NINDS. Nerve pain, called neuropathic pain, comes from nerve damage due to an injury or disease. It is often described as burning, tingling, shooting or like electric shocks, and shingles and sciatica are among the examples.
Does chronic pain always have a clear cause?
No. Sometimes the original cause was an injury or infection, sometimes there is an ongoing cause, and in some cases there is no clear cause. Among the ways chronic pain can arise, NCCIH lists an underlying disease or health condition, an injury, medical treatment such as surgery, inflammation, or a problem in the nervous system, and it says the cause may be unknown. Not every person with chronic pain has a health problem diagnosed by a provider, according to NCCIH. With back pain, it is possible that no specific cause can be identified for the start of it.
What details about long-lasting pain are worth recording?
Duration, location, pattern and triggers all appear on NIH Health's list of helpful details for describing pain, which it says can help healthcare providers look for causes. The list includes how long you have had the pain, how often it occurs and how long it lasts; where you feel it and whether it stays in one spot, spreads or radiates; how it feels and how severe it is; whether it is constant or comes and goes; what activities or body positions make it worse or better; and anything that seems to trigger it. For migraine, NINDS suggests noting, after each headache, the time of day, how intense it was and how long it lasted, any sensitivity to light, smells or sound, the activity right before it started, the previous night's sleep, weather or routine changes, and food and drink in the previous 24 hours. For effect on daily life, MedlinePlus says that if the cause of your pain is unknown, a provider may ask you to describe the pain and how it affects your life.
What is high-impact chronic pain, and how common is chronic pain?
In CDC's 2023 National Health Interview Survey data, 24.3% of U.S. adults reported chronic pain and 8.5% reported high-impact chronic pain. In that survey, chronic pain means pain on most days or every day during the past 3 months, and the high-impact group also reported that pain limited life or work activities on most days or every day. Reported chronic pain rose with age, from 12.3% of adults ages 18 to 29 to 36.0% of those 65 and older.
What could I ask my care team about how my pain is described?
You could ask how your team is describing your pain: when they count it as starting, whether it is one pain or more than one, and what they think is behind it. NINDS says a person's report of their own pain is the best measure, and that people might have one or more chronic pain conditions at the same time. Providers may use exams, tests and imaging to diagnose or rule out conditions causing or associated with pain, so a fair question is what each exam, test or scan in your records was checking for.
Sources
- MedlinePlus: Chronic Pain (NLM; health-topic page, no review date shown): MedlinePlus says chronic pain lasts longer than three months or the time in which you should have healed.
- MedlinePlus: Chronic Pain (NLM; health-topic page, no review date shown): MedlinePlus says chronic pain can occur most days or every day and may last for weeks, months, or even years.
- NINDS: Pain (NIH; page text, no review date shown): NINDS says chronic pain can happen without a known cause and can persist after an injury or known cause is resolved.
- NINDS: Pain (NIH; page text, no review date shown): NINDS says pain can make it harder to do necessary tasks, work, and enjoy activities.
- CDC Clinical Practice Guideline for Prescribing Opioids for Pain — United States, 2022, MMWR Recomm Rep 2022;71(No. RR-3) (Introduction > Background): CDC's 2022 clinical guideline defines acute pain as lasting less than 1 month, subacute pain as 1 to 3 months and chronic pain as more than 3 months.
- CDC Clinical Practice Guideline for Prescribing Opioids for Pain — United States, 2022, MMWR Recomm Rep 2022;71(No. RR-3) (Scope and Audience): CDC's 2022 clinical guideline says its time-bound definitions are not meant to be absolute but approximate guides, because pain often gradually transitions from acute to chronic.
- NCCIH: Chronic Pain and Complementary Health Approaches: Usefulness and Safety (last updated January 2023; section "What Is Chronic Pain and Why Is It Important?"): NCCIH says chronic pain is pain that lasts more than several months, variously defined as 3 to 6 months, but longer than "normal healing".
- NIAMS: Back Pain (NIH; sections "Overview of Back Pain", "Types of Back Pain", "Causes of Back Pain"): NIAMS says chronic back pain may come on quickly or slowly, lasts longer than 12 weeks and occurs daily.
- NINDS: Pain (NIH; page text, no review date shown): NINDS says acute pain starts suddenly and ends when its cause is treated or healed.
- NINDS: Pain (NIH; page text, no review date shown): NINDS says the feeling of acute pain is usually sharp because it tends to act as a warning signal about a threat to the body, and lists strained muscles and broken bones among common causes.
- NINDS: Pain (NIH; page text, no review date shown): NINDS says an acute pain condition might persist and become chronic pain, and in other cases chronic pain happens for no known reason.
- NINDS: Pain (NIH; page text, no review date shown): NINDS says people might experience one or more chronic pain conditions, or chronic and acute pain, at the same time.
- NCCIH: Chronic Pain and Complementary Health Approaches: Usefulness and Safety (last updated January 2023; section "What Is Chronic Pain and Why Is It Important?"): NCCIH says that among people with chronic pain who have a health problem diagnosed by a provider, a national survey found low-back pain among the most frequent conditions, and lists migraine among other common diagnoses.
- NIAMS: Back Pain (NIH; sections "Overview of Back Pain", "Types of Back Pain", "Causes of Back Pain"): NIAMS says back pain can range from a dull, constant ache to a sudden, sharp pain that may shoot down the leg.
- NINDS: Migraine (NIH; sections "What is migraine?", "Types of migraine", "Keeping a headache journal"): NINDS says migraine is a health condition that is more than having a bad headache, with symptoms that often include headaches that keep coming back along with other symptoms.
- NINDS: Migraine (NIH; sections "What is migraine?", "Types of migraine", "Keeping a headache journal"): NINDS says chronic migraine happens when headaches from migraine happen on at least 15 days of the month for more than three months.
- NINDS: Pain (NIH; page text, no review date shown): NINDS says neuropathic pain is pain caused by nerve damage due to an injury or disease, often described as burning, tingling, shooting, or like electric shocks, and lists shingles and sciatica among examples.
- NCCIH: Chronic Pain and Complementary Health Approaches: Usefulness and Safety (last updated January 2023; section "What Is Chronic Pain and Why Is It Important?"): NCCIH says chronic pain may result from an underlying disease or health condition, an injury, medical treatment (such as surgery), inflammation, or a problem in the nervous system, or the cause may be unknown.
- NCCIH: Chronic Pain and Complementary Health Approaches: Usefulness and Safety (last updated January 2023; section "What Is Chronic Pain and Why Is It Important?"): NCCIH says not all people with chronic pain have a health problem diagnosed by a health care provider.
- MedlinePlus: Chronic Pain (NLM; health-topic page, no review date shown): MedlinePlus says acute pain can become chronic pain, that the original cause may have been an injury or infection or an ongoing cause of pain, and that in some cases there is no clear cause.
- NIAMS: Back Pain (NIH; sections "Overview of Back Pain", "Types of Back Pain", "Causes of Back Pain"): NIAMS says it is possible that no specific cause can be identified for the start of back pain.
- NIH Health: Pain (health.nih.gov; section "Diagnosis", no review date shown): NIH Health says describing pain clearly can help healthcare providers look for causes.
- NIH Health: Pain (health.nih.gov; section "Diagnosis", no review date shown): NIH Health lists, as helpful information when describing pain, how long you have had the pain, and how often the pain occurs and how long it lasts.
- NIH Health: Pain (health.nih.gov; section "Diagnosis", no review date shown): NIH Health lists, as helpful information, where you feel the pain and whether it stays in one spot, spreads out, or radiates.
- NIH Health: Pain (health.nih.gov; section "Diagnosis", no review date shown): NIH Health lists, as helpful information, how the pain feels and how severe it is, and whether it is constant or comes and goes.
- NIH Health: Pain (health.nih.gov; section "Diagnosis", no review date shown): NIH Health lists, as helpful information, what activities or body positions make the pain worse or better, and anything that seems to trigger the pain.
- NINDS: Migraine (NIH; sections "What is migraine?", "Types of migraine", "Keeping a headache journal"): NINDS's headache-journal list for migraine includes, after each headache: time of day, how intense it was and how long it lasted, any sensitivity to light, smells, or sound, any activity right before it started, the quality and length of the previous night's sleep, the weather or changes in daily routine, and food and drinks consumed in the previous 24 hours.
- MedlinePlus: Chronic Pain (NLM; health-topic page, no review date shown): MedlinePlus says that if the cause of your pain is unknown, your health care provider may ask you to describe the pain and how it affects your life.
- CDC/NCHS Data Brief No. 518: Chronic Pain and High-impact Chronic Pain in U.S. Adults, 2023 (last reviewed November 21, 2024; Key findings, Figures 1-2, Definitions): CDC's NCHS data brief bases chronic pain on survey responses of "most days" or "every day" to how often respondents had pain in the past 3 months.
- CDC/NCHS Data Brief No. 518: Chronic Pain and High-impact Chronic Pain in U.S. Adults, 2023 (last reviewed November 21, 2024; Key findings, Figures 1-2, Definitions): CDC's NCHS data brief defines high-impact chronic pain as chronic pain where the person also reported that pain limited life or work activities "most days" or "every day" over the past 3 months.
- CDC/NCHS Data Brief No. 518: Chronic Pain and High-impact Chronic Pain in U.S. Adults, 2023 (last reviewed November 21, 2024; Key findings, Figures 1-2, Definitions): CDC's NCHS data brief reports, from 2023 National Health Interview Survey data, that 24.3% of U.S. adults reported chronic pain and 8.5% reported high-impact chronic pain.
- CDC/NCHS Data Brief No. 518: Chronic Pain and High-impact Chronic Pain in U.S. Adults, 2023 (last reviewed November 21, 2024; Key findings, Figures 1-2, Definitions): CDC's NCHS data brief reports, from the same survey, that the percentage of adults with chronic pain rose with age, from 12.3% of adults ages 18-29 to 36.0% of adults age 65 and older.
- NINDS: Pain (NIH; page text, no review date shown): NINDS says a person's report of their own pain is the best measure of pain.
- NINDS: Pain (NIH; page text, no review date shown): NINDS says that after learning about a person's pain history and other medical concerns, a healthcare provider may conduct physical exams and clinical assessments and order tests and imaging to diagnose or rule out conditions causing or associated with pain.
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