What Causes Stress? Common Triggers and Stressors

What Is a Stressor?

In psychology and medicine, any event, situation, condition, or demand that can trigger a stress response is referred to as a stressor. A stressor can originate from the external environment or from internal experiences.^[7]

Stressors can take many different forms:

• External stressors: Concrete situations or demands in the world around you, such as workplace deadlines, financial pressures, or caring for a family member.
• Internal stressors: Worries, expectations, thoughts about future threats, or other internal experiences that require coping or adjustment.
• Brief stressors: Short-term challenges that resolve relatively quickly (explore acute stress mechanisms).
• Repeated or prolonged stressors: Ongoing conditions that persist over weeks, months, or years without clear resolution, driving cumulative allostatic load.

To understand the biological cascade that occurs when your body encounters a stressor, explore our guide on how the stress response works in your body and our scientific stress glossary.

Common Causes of Stress

Many common situations and life pressures can contribute to stress.^{[1–2, 4–6]}

Work and Study Pressure

Workplace and academic environments are frequent sources of daily pressure. Common triggers include heavy workloads, tight deadlines, preparing for exams, job insecurity, periods of unemployment, difficult relationships with colleagues or managers, and feeling that you have little influence over important aspects of your work.

Money and Financial Pressure

Financial difficulties can create sustained psychological pressure. Common financial stressors include money problems, debt or borrowing, unstable or irregular income, unexpected expenses, and ongoing financial uncertainty.

Relationships and Family

Interpersonal dynamics provide essential support, but they can also be a significant source of tension. Stress can arise from ongoing conflict with a partner, navigating a separation or divorce, parenting challenges, caregiving responsibilities, or feelings of loneliness and lack of support.

Health and Caregiving

Illness, injury, ongoing health concerns, and caregiving responsibilities can all be significant sources of stress, requiring continuous energy and emotional adaptation.

Loss and Major Life Changes

Major life transitions disrupt established routines and require substantial adaptation. Significant life changes include bereavement, moving home, starting a new job, retiring, getting married, or having a baby.

Wider Events and Community Stressors

Pressures outside your immediate personal circle can also influence stress levels. Significant economic crises, disease outbreaks, natural disasters, war, and exposure to community violence can create pervasive feelings of uncertainty and disruption.

How Thoughts, Expectations and Uncertainty Can Influence Stress

While external pressures are tangible and real, how a person interprets a situation can influence the stress response. Internal cognitive factors that can contribute to feelings of strain include:

• Uncertainty and anticipation: Not knowing how a situation will unfold often prompts the mind to anticipate negative outcomes, which can maintain heightened physiological alertness.
• Very high expectations: Holding oneself to strict perfectionistic standards can make everyday tasks feel high-stakes.
• Fear of failure: Worrying about making mistakes or falling short of expectations can amplify pressure around ordinary responsibilities.
• Competing demands: Feeling pulled in multiple directions at once can make prioritization difficult.
• Feeling that a situation is outside one's control: Facing circumstances where personal influence feels limited can increase feelings of strain.

Recognizing the role of cognitive appraisal is not about self-blame. External constraints - such as financial hardship, illness, or caregiving duties - remain fully real and challenging, regardless of how they are framed.

Why Does the Same Situation Affect People Differently?

A scenario that feels overwhelming to one person might feel manageable to another. Individual responses to stressors are shaped by a combination of factors.^{[8, 10]}

• Past experience and familiarity: Having successfully navigated a similar challenge in the past can provide practical reference points and confidence.
• Health, sleep, and existing fatigue: Health, sleep, existing fatigue, and other demands can influence how manageable a new challenge feels.
• Available resources and social support: Available social and practical support can influence how manageable a situation feels.
• Coping strategies: The habits, routines, and problem-solving approaches a person relies on when pressure mounts.
• Perceived control: Psychological research, including theoretical analysis by Folkman (1984), highlights that perceived control can influence appraisal and coping processes, but greater perceived control does not automatically mean lower stress in every situation.
• Competing life demands: When a new challenge arrives on top of existing background pressures, the combined cumulative demands can make even smaller issues feel intense.

Can Positive Events Cause Stress?

It is a common misconception that only unpleasant events cause stress. Major positive life milestones can also introduce significant stress.^[2]

Positive life events can still involve major change, unfamiliar demands, new responsibilities or uncertainty. Examples include:

• Buying a home or moving house.
• Getting married or planning a wedding.
• Starting a new job or promotion.
• Having a baby or expanding your family.
• Retirement and adjusting to new daily routines.

It can be understandable to feel stretched during a positive life transition; experiencing stress does not mean that the event is unwanted or negative.

Short-Term vs. Ongoing Causes of Stress

Understanding whether a stressor is temporary or ongoing can help you think about what kind of response or support may be useful:

Short-Term Stressors

Short-term (acute) stressors have a clear beginning and end. Examples include sitting an exam, giving a presentation, having a disagreement, or managing an unexpected car repair. The stress response often eases as the situation resolves.

Ongoing Stressors

Ongoing (chronic) stressors persist over weeks, months, or years without a definite conclusion. Examples include sustained work pressure, financial insecurity, long-term caregiving, persistent relationship conflict, or chronic health problems.

When demands remain continuous, the body may have fewer opportunities for restorative recovery. Learn more about the physiological effects of long-term strain in our guide on chronic stress and cortisol.

How Can You Identify What Is Causing Your Stress?

When you feel tense or overwhelmed, the root cause may not always be immediately obvious. You can use these practical self-observation questions to help clarify what might be driving your stress:

• What was happening before I noticed the tension? Was there a specific conversation, notification, task, or environment that preceded the feeling?
• Is this situation temporary or ongoing? Does this demand have a clear endpoint, or is it an ongoing background pressure?
• Are several demands happening at once? Am I trying to manage multiple competing deadlines or family responsibilities simultaneously?
• Is there something I feel unable to influence? Am I spending energy trying to control aspects of a situation that are outside my power?
• Does the stress change when the situation changes? Does tension ease slightly when stepping away from work or taking a weekend break?
• Is it affecting sleep, work, or relationships? Which areas of daily functioning are feeling the greatest impact?

Some people find it helpful to briefly note down the situation, time, how they felt, and the apparent trigger over a few days to spot recurring patterns.

What If You Feel Stressed but Cannot Identify a Cause?

It is completely normal to feel stressed without being able to point to a single major event. Several smaller demands can accumulate gradually over time, creating an overall sense of strain even when no single cause stands out.

Sleep problems, fatigue and anxiety can overlap with stress and sometimes make the underlying cause harder to identify. To learn more about how physical and emotional tension presents, read our detailed guide on stress symptoms and signs.

If your feelings of stress are persistent, unmanageable, or interfering significantly with your everyday life, speaking with a healthcare professional or qualified counselor can provide helpful perspective and tailored support.