Flares and Remissions in Autoimmune Diseases: Why Symptoms Come in Waves

Many people with autoimmune diseases face the same question: why does the condition seem relatively stable today, only for symptoms to suddenly worsen a few days or weeks later without any obvious reason? Why do periods of improvement give way to worsening symptoms, followed again by temporary stabilization?

This wave-like pattern is one of the characteristic features of many autoimmune diseases. Lupus, rheumatoid arthritis, psoriatic arthritis, inflammatory bowel diseases, multiple sclerosis, and a number of other conditions often progress through alternating phases of relative well-being and periods of increased disease activity.

In medical literature, these periods are commonly referred to as remission and flare. However, there is a much more complex biological relationship between these two states than may appear at first glance.

Understanding the mechanisms behind flares helps not only with better disease management but also with a more informed understanding of the factors that can influence immune system activity.

What Are Remission and Flare?

What Happens During Remission

Remission does not always mean the complete disappearance of the disease.

In many cases, it is a state in which:

• symptoms are significantly reduced;
• inflammatory activity decreases;
• quality of life improves;
• the disease becomes more manageable;
• laboratory markers stabilize.

It is important to understand that even during remission, the immune system does not always return to the state of a person without an autoimmune disease.

Often, remission represents a temporary balance between immune activity and the body’s ability to compensate for its effects.

What Happens During a Flare

A flare represents a period of increased disease activity.

During this time, the following may worsen:

• joint pain;
• muscle pain;
• fatigue;
• skin manifestations;
• digestive disturbances;
• neurological symptoms;
• inflammatory laboratory markers.

The intensity of flares can vary considerably. In some individuals, a flare may involve only a mild increase in symptoms, while in others it can result in significant deterioration and the need for treatment adjustments.

Why Autoimmune Diseases Follow a Wave-Like Pattern

The immune system is a complex network of interactions involving the nervous system, endocrine system, microbiome, metabolism, and numerous immune cells.

For this reason, disease activity rarely depends on a single factor.

More often, the development of a flare is influenced by a combination of several processes occurring simultaneously.

These include:

• genetic predisposition;
• current immune system activity;
• systemic inflammation levels;
• hormonal changes;
• sleep quality;
• stress levels;
• infections;
• lifestyle factors;
• smoking;
• nutrition;
• treatment adherence.

This is why two people with the same diagnosis may experience very different frequencies and severities of flares.

What Can Trigger a Flare?

Infections

Infectious illnesses are among the most well-studied triggers of autoimmune flares.

Even a relatively mild viral infection can activate the immune system and temporarily intensify inflammatory processes.

After recovery, autoimmune symptoms may remain increased for some time.

Chronic Stress

The relationship between stress and the immune system has been actively studied for decades.

Stress is not considered a direct cause of most autoimmune diseases, but it can influence neuroimmune mechanisms.

Prolonged psychological stress may be associated with changes in cortisol production, inflammatory cytokine activity, and autonomic nervous system function.

This is why many patients report worsening symptoms following major life events, emotional overload, or extended periods of chronic stress.

Physical Overload

Moderate physical activity is generally considered beneficial for most patients.

However, excessive physical exertion, particularly during unstable periods of disease activity, may sometimes act as an additional stressor for the body.

In such situations, inflammatory responses and symptom severity may increase.

Smoking

Smoking is associated with a higher risk of developing several autoimmune diseases and may contribute to increased activity in existing conditions.

This association has been particularly well documented in rheumatoid arthritis and certain other immune-mediated inflammatory disorders.

Abrupt Discontinuation of Treatment

One of the most significant risk factors for flare development remains the sudden discontinuation of prescribed treatment.

Even when a patient feels well, abruptly stopping therapy can lead to a return of inflammatory activity and an increased risk of complications.

Trigger, Background Factor, Symptom Amplifier, and Tissue Damage: Understanding the Difference

One of the most common mistakes is treating all contributing factors as equally harmful.

In reality, there are important differences between them.

Trigger

A trigger is an event that may initiate a new flare.

Examples include:

• viral infection;
• severe stress;
• surgery;
• abrupt discontinuation of treatment.

Background Factor

A background factor does not directly cause a flare but creates conditions in which the immune system becomes more vulnerable.

Examples include:

• chronic sleep deprivation;
• prolonged psychological stress;
• metabolic disturbances;
• low physical activity.

Symptom Amplifier

Some factors do not increase disease activity but make symptoms more noticeable.

Examples include:

• poor sleep;
• anxiety;
• exhaustion;
• high environmental temperatures.

A person may feel significantly worse even though objective disease activity remains unchanged.

Tissue Damage

Tissue damage is the direct result of the inflammatory process itself.

It is tissue damage that is primarily responsible for the long-term complications of autoimmune diseases.

For this reason, treatment aims not only to reduce symptoms but also to control inflammatory activity.

What People Often Confuse

Every Worsening of Symptoms Is a Flare

Not every increase in symptoms indicates a disease flare.

Sometimes symptoms worsen because of:

• infection;
• sleep disturbances;
• emotional overload;
• dehydration;
• medication side effects.

This is why disease activity should always be evaluated comprehensively.

Stress Causes the Disease

Current evidence does not support the idea that stress is the sole cause of autoimmune diseases.

However, stress can influence disease progression and intensify existing immune regulation disturbances.

Absence of Symptoms Means Absence of Disease

Remission does not always mean that the pathological process has completely stopped.

Even when symptoms are minimal, ongoing monitoring and disease management may still be necessary.

Why It Is Important to Track Personal Flare Patterns

One of the most useful self-monitoring tools may be a symptom diary.

It can help identify patterns between:

• stressful events;
• sleep quality;
• physical activity;
• infections;
• dietary changes;
• medication use;
• symptom worsening.

Over time, many patients begin to notice recurring relationships between specific factors and deterioration in their condition.

While this may not completely prevent flares, it can help individuals better understand their disease and manage risk factors more effectively.

How to Keep a Flare Tracking Diary

For each day, it may be useful to record:

• energy levels;
• severity of key symptoms;
• sleep quality;
• stress levels;
• physical activity;
• presence of infections;
• treatment changes;
• unusual events.

Even a few months of observations can provide information that may not be apparent during a single medical appointment.

Key Takeaways

• Many autoimmune diseases are characterized by alternating periods of remission and flare.
• Flares rarely occur because of a single factor.
• Stress, infections, smoking, physical overload, and abrupt discontinuation of treatment may act as flare triggers.
• Not every worsening of symptoms indicates increased disease activity.
• It is important to distinguish between triggers, background factors, symptom amplifiers, and true tissue damage.
• Symptom diaries can help identify individual flare patterns.
• Disease management requires understanding both immunological and psychophysiological factors.

FAQ

Conclusion

Flares and remissions are a natural part of the course of many autoimmune diseases. Behind this wave-like pattern lies a complex interaction between the immune system, nervous system regulation, hormonal mechanisms, inflammatory processes, and environmental influences.

Understanding the differences between a trigger, a background factor, a symptom amplifier, and actual tissue damage helps individuals evaluate their condition more objectively and avoid common mistakes when interpreting symptoms.

If symptoms regularly return in waves, it may be useful to look beyond individual episodes and focus on the broader pattern. This approach often helps reveal relationships that remain invisible when each flare is viewed in isolation.