One of the most confusing aspects of autoimmune disease is that symptoms rarely follow a straight line.
Many people describe weeks or months where they feel relatively stable, followed by sudden periods of worsening fatigue, pain, digestive symptoms, or neurological changes. Then, just as unexpectedly, those symptoms may ease again.
This pattern is known as flares and remissions, and understanding what’s happening underneath it can be both clarifying and empowering.
An autoimmune flare occurs when immune activity and inflammatory signaling increase, leading to a noticeable intensification of symptoms. During a flare, immune cells become more aggressive toward the body’s own tissues resulting in increased inflammation, cytokine signaling and tissue irritation or damage.
This heightened immune activity requires energy, which is why flares are often accompanied by profound fatigue, brain fog, or a general sense of being unwell, similar to how you might feel during an infection, even when no infection is present.
Importantly, flares are not random. They reflect real, measurable shifts in immune behavior.
Remission does not necessarily mean the autoimmune disease has disappeared. Instead, remission refers to a period where immune activity has settled, inflammatory signaling has decreased and symptoms become milder or less disruptive.
In remission, the immune system is quieter, not cured, but think of it being more regulated. Many people function well during these phases and may even question whether anything is “wrong” at all. This back-and-forth cycle is one of the reasons autoimmune disease can be so difficult to identify early.
Autoimmune activity fluctuates because the immune system is constantly responding to internal and external inputs.
Common contributors to flares include:
Latent or chronic infections, gut dysbiosis, or immune cross-reactivity can periodically reactivate immune signaling, increasing inflammation.
Chronic stress alters cortisol regulation and immune balance. Many patients notice flares following emotional stress, major life changes, or prolonged mental strain — even when lifestyle habits haven’t changed dramatically.
The gut is a major site of immune regulation. Shifts in gut inflammation, permeability, or microbial balance can amplify immune activation elsewhere in the body.
Changes in sleep quality, circadian rhythm, illness, or other physiologic stressors can tip immune balance toward inflammation.
When these factors accumulate, the immune system may cross a threshold, resulting in a flare.
One of the most common misconceptions we see is the idea that symptoms must be constant to be real.
In autoimmune disease, intermittent symptoms are the rule, not the exception.
The immune system does not operate at a fixed level. It responds dynamically, sometimes quietly, sometimes aggressively. A period of symptom relief does not invalidate previous symptoms, nor does it mean investigation is no longer warranted.
This is why autoimmune disease is often underdiagnosed or dismissed early on.
During flares, fatigue often becomes one of the most disruptive symptoms.
Autoimmune-related fatigue differs from everyday tiredness in that it:
This type of fatigue reflects the energy cost of immune activation and repair from inflammatory activity, not deconditioning or motivation. Recognizing this distinction is an important step in validating symptoms, both for patients and clinicians.
Yes.
While autoimmune disease cannot always be “cured,” immune behavior can often be regulated. When contributing factors are identified, such as immune triggers, inflammatory signaling patterns, stress physiology, or gut-immune dysregulation, many patients experience fewer flares, shorter duration of flares, reduced symptom intensity and longer periods of stability between flares.
The goal of care is not just symptom suppression during a flare, but reducing the likelihood of future flares altogether.
Understanding flares vs. remission changes how people relate to their condition.
Instead of viewing symptoms as unpredictable or uncontrollable, flares become signals or indicators that the immune system is under strain or responding to a trigger.
This shift allows for:
For many people, simply understanding why symptoms come and go brings a sense of relief after years of uncertainty.
If you’re living with fluctuating symptoms, ongoing fatigue, or an autoimmune diagnosis and want a clearer understanding of what may be driving your immune activity, a conversation is often the best place to start.
Book your complimentary Discovery Call today.
During this no-cost call, our Patient Care Advisor will:
