Remission means a disease’s signs and symptoms have decreased significantly or become undetectable. It does not mean the disease is cured. Doctors use the term specifically because it acknowledges improvement while recognizing that the condition could return. The exact criteria for remission vary depending on the disease, but the core idea is the same: measurable indicators have dropped below a defined threshold.
Complete vs. Partial Remission
The most important distinction in remission is between complete and partial. In complete remission, there is no detectable evidence of disease on physical exams, blood work, or imaging tests. A person with lung cancer in complete remission, for example, would have clear scans and no symptoms. You may also hear the phrase “no evidence of disease,” or NED, which means the same thing.
Partial remission means the disease has responded to treatment and measurably improved, but it hasn’t disappeared entirely. In cancer, this typically means tumors have shrunk significantly but are still visible on scans. Partial remission is still a meaningful milestone because it often means treatment is working and symptoms have improved, even if the disease remains present at lower levels.
Why Doctors Say Remission Instead of Cure
Clinicians choose the word “remission” deliberately. A cure implies the disease is completely gone with no chance of returning, and that’s extremely difficult to guarantee. As one oncologist at MD Anderson Cancer Center put it, saying someone is “cancer-free” implies no residual disease exists anywhere in the body and no chance of recurrence, which is a much harder claim to support than saying there’s currently no detectable disease. Even after successful treatment, small numbers of disease cells can persist in the body without showing up on any test. For this reason, most doctors will say there are no signs of disease at this time rather than declaring a cure.
How Remission Is Defined in Cancer
Cancer remission is confirmed through a combination of physical exams, blood tests, and imaging. If all of these come back clean, the patient is considered in complete remission. Doctors continue monitoring with routine blood work and scans afterward because recurrence is always possible.
The five-year mark carries special significance in oncology. If you remain in complete remission for five years or more, some doctors will use the word “cured.” The reasoning is statistical: for most cancers that do come back, recurrence happens within those first five years. But this isn’t absolute. Some cancers can return after a decade or longer, which is why even the five-year milestone comes with monitoring rather than a clean bill of health.
Remission in Type 2 Diabetes
Remission isn’t only a cancer term. In type 2 diabetes, an international consensus group defined remission as having an HbA1c (a measure of average blood sugar over roughly three months) below 6.5% for at least three months after stopping all blood sugar-lowering medications. That 6.5% threshold is the same number used to diagnose diabetes in the first place, so remission essentially means your blood sugar has returned to pre-diabetes levels on its own.
The key requirement is that this improvement holds without medication. If your blood sugar only stays normal because of drugs, that’s well-managed diabetes, not remission. People who achieve remission through significant weight loss or metabolic surgery still need ongoing monitoring, because blood sugar levels can climb again over time.
Remission in Depression
Mental health conditions also use formal remission criteria. For major depression, remission is defined by scoring below 5 on the PHQ-9, a nine-question screening tool that rates symptoms like sleep problems, low energy, and difficulty concentrating on a scale from 0 to 3. A score above 9 indicates clinically significant depression, so dropping below 5 represents a return to minimal or no symptoms. The standard benchmark used in clinical quality measures is achieving this score within twelve months of the initial diagnosis.
Remission in Autoimmune Disease
Rheumatoid arthritis has some of the most precisely defined remission criteria in medicine. The American College of Rheumatology and EULAR (its European counterpart) established two methods for determining remission. The simpler one, called the Boolean definition, requires that four separate measures each score at or below 1: tender joint count, swollen joint count, the patient’s own rating of overall disease activity, and a blood marker of inflammation called C-reactive protein. If any single measure exceeds that threshold, remission isn’t met.
The second method adds these scores together along with a physician’s assessment, and remission is defined as a combined score of 3.3 or less. These strict thresholds exist because rheumatoid arthritis can cause joint damage even when symptoms feel manageable, so remission needs to reflect genuinely low disease activity rather than just feeling okay.
How Remission Is Maintained
Reaching remission is one thing. Staying there often requires ongoing treatment. In many cancers and autoimmune diseases, doctors prescribe maintenance therapy after the initial treatment brings the disease under control. The goal is to keep the disease suppressed and extend the time before any potential return. In one study of acute myelogenous leukemia, patients who received monthly maintenance treatment stayed in remission for a median of 10.3 months compared to 6.7 months for those who received no maintenance therapy.
For chronic conditions like rheumatoid arthritis, Crohn’s disease, or depression, maintenance treatment may continue indefinitely. This could mean staying on a lower dose of medication, attending regular therapy sessions, or following a specific lifestyle regimen. The fact that maintenance is needed doesn’t mean treatment has failed. It reflects the nature of diseases that can flare when the factors keeping them in check are removed.
Relapse and Recurrence
When a disease returns after remission, clinicians distinguish between different patterns. A lapse is a temporary, short-lived return of symptoms that resolves when existing treatment strategies are maintained. A relapse is more severe and prolonged, representing a full return of the disease that may require a new or modified treatment approach. The defining difference is duration and severity: a brief flare that settles down is fundamentally different from a sustained worsening.
Recurrence is the broader term, often used in cancer to describe the disease coming back after a period of complete remission. It can happen at the original site, in nearby tissue, or in a distant part of the body. The risk of recurrence is the primary reason doctors avoid the word “cure” and continue monitoring patients long after remission is achieved.
Spontaneous Remission
In rare cases, diseases go into remission without any treatment at all. Spontaneous remission in cancer is well documented but extraordinarily uncommon, occurring in roughly 1 in 60,000 to 100,000 cases. Certain cancers show higher rates: melanoma has a spontaneous remission rate of about 1 in 400 patients, and cancers like lymphoma, neuroblastoma, and kidney cancer also have more documented cases than average. Researchers have identified infections as a possible trigger in some cases, particularly in leukemia, where infection preceded remission in the majority of recently reported cases. Despite these observations, spontaneous remission remains unpredictable and far too rare to factor into treatment decisions.