Stress is a natural bodily response to external physical, psychological, or psychosocial demands.

Not all stress is the same, which is why it makes sense to talk about types of stress: we distinguish them by duration (acute, episodic acute, and chronic) and by the effect they have on us (eustress and distress). 

Understanding which category your feelings fall into is the first step toward knowing whether you need to adjust your habits or seek professional support.

👉 If you are looking for the causes and warning signs, we have an article dedicated to that: Discover the causes and symptoms of stress.

Types of stress at a glance

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The first three are organized by time. The last two are organized by valence, meaning whether the experience ends up being adaptive or harmful.

In other words, these are complementary axes: acute stress can be eustress or distress, depending on the context and the person's resources.

Acute stress

Acute stress is the most common and most recognizable form. It arises in response to a specific, short-term event, such as a tight deadline, slamming on the brakes in traffic, or an unexpected presentation. 

Activation is rapid, involves the autonomic nervous system and the hypothalamic-pituitary-adrenal axis, and lasts from seconds to a few days. 🧠

In controlled doses, it leaves no lasting marks on the body. It is the type of stress that increases focus before a test or an important meeting, which dissipates once the situation is over.

Be careful not to confuse these common terms: "acute stress" (a normal reaction) is not the same as "Acute Stress Disorder," which is a clinical diagnosis that we address below.

Episodic acute stress

Here, it is not the intensity that changes, but the frequency. We refer to episodic acute stress when acute stress episodes repeat without enough recovery time in between: overloaded schedules, too many commitments, constant interpersonal friction. ⚡

The key difference compared to acute stress is that the body no longer returns to its baseline. The physical tension, migraines, and increased anxiety that usually accompany it are reversible, but they require the pattern to be broken. Without that break, the natural path is for it to become chronic.

Chronic stress

Chronic stress is pressure that persists for months or years with no prospect of relief. It stems from structural and prolonged situations, financial difficulties, sustained illness, dysfunctional family relationships, an unsustainable work environment...

This is the type of stress with the most serious health consequences. ⚠️

Research links it to accelerated biological aging, changes in immune function, and mood disorders. In short, it is the price the body pays for being in a state of permanent mobilization throughout life.

Eustress and Distress

Not all stress classification is based solely on its duration.

👍 Eustress is constructive stress, associated with life milestones, planned transitions, or challenges that a person feels capable of overcoming. It acts as a moderate level of demand that promotes adaptation and resilience.

👎 In contrast, distress is the opposite: uncontrollable demands, serious losses, or threats that exceed a person's resources and exhaust their biological systems.

What about work-related stress?

The workplace context deserves special attention due to the scale of the problem in Portugal. 💼

In 2023, the Portuguese Psychologists Association estimated that stress and psychological health issues at work cost the country 5.3 billion euros per year, a figure that has risen by more than 60% in two years!

At work, all three types of stress can coexist:

• A one-off spike before a deadline is acute stress.
• A permanently overloaded calendar produces episodic acute stress. 
• An unsustainable work environment over several years produces chronic stress, and it is in this environment that burnout develops, a syndrome of exhaustion specifically linked to the professional context.

📌 If you feel you need to reduce burnout, maintain focus, and improve self-regulation in high-pressure work situations, you might be interested in our Peak Performance Training.

What about post-traumatic stress?

Post-traumatic stress often appears on lists of stress types, but from a clinical perspective, it belongs to a different category.

It is triggered by exposure to traumatic events, such as war, natural disasters, or prolonged abuse. 🤯

Those who develop it persistently relive the trauma, through intrusive memories, nightmares, and intense physical reactions whenever the event is recalled. 

It can become debilitating and seriously compromise quality of life and mental health.

What is the difference between stress and anxiety?

Stress is a reaction to a specific external factor—an event that has occurred or is ongoing—and it tends to subside once that factor disappears.

A anxiety is characterized by excessive and persistent worry that remains even without an identifiable external element, and which is often directed toward the future.

A practical way to distinguish between them: ask yourself if the discomfort would disappear once the situation worrying you is resolved. 

If the answer is yes, you are likely dealing with stress. If the discomfort persists and shifts to another subject, it is closer to a state of anxiety.

Final thoughts

Understanding the different types of stress is not just a theoretical exercise; it changes what you do next:

🫁 A spike of acute stress before a presentation calls for breathing and preparation. 

📅 A pattern of episodic acute stress calls for reorganizing routines and setting boundaries.

🥼 A state of chronic stress installed requires monitoring, as it rarely resolves on its own.

The useful question isn't "am I stressed?", because everyone is, but rather "what kind of stress do I have, how long has it been going on, and what is it already costing me?"

If you recognized yourself in episodic acute stress or chronic stress, a professional assessment can help you understand where you stand and define an appropriate intervention plan. Have any questions? Get in touch!

References

American Psychological Association. Stress: acute, episodic acute and chronic.

Epel, E., et al. (2018). More than a feeling: A unified view of stress measurement for population science. Frontiers in Neuroendocrinology, 49, 146-169. https://doi.org/10.1016/j.yfrne.2018.03.001

Lu, S.-Y., Wei, F., & Li, G.-L. (2021). The evolution of the concept of stress and the framework of the stress system. Cell Stress, 5, 76-85. https://doi.org/10.15698/cst2021.06.250

Marinova, I., & Radeva, N. (2019). The basics of stress. Factors and symptoms. https://doi.org/10.14748/vmf.v8i2.6205

Ovsiannikova, Y., et al. (2024). Peculiarities of the impact of stress on physical and psychological health. Multidisciplinary Science Journal. https://doi.org/10.31893/multiscience.2024ss0711

Suglia, S., et al. (2025). Stress across the lifecourse and adult mental and physical health outcomes. Annals of Behavioral Medicine, 59. https://doi.org/10.1093/abm/kaaf001

Sushmitha, S., et al. (2023). Stress, a Great Impact on Mental Health. https://doi.org/10.52711/2349-2996.2023.00050

Thomas, R., & Bala, B. N. (2022). Association of pre-test level of stress and coping strategies. https://doi.org/10.47211/tg.2022.v09i01.019

Portuguese Psychologists Association (2023). The Cost of Stress and Psychological Health Problems at Work in Portugal.