How stress affects the body

When a person is under stress, the body activates its “fight or flight” response. This involves:

  • Release of stress hormones such as adrenaline and cortisol
  • Increased muscle tension
  • Changes in breathing and heart rate
  • Altered digestion
  • Heightened awareness of bodily sensations

When stress is short-lived, the body usually returns to baseline. When stress is ongoing, these responses can become persistent and start to cause symptoms.

Common physical symptoms linked to stress

Stress commonly affects muscles and posture.

People may notice:

  • Neck, shoulder or back pain
  • Jaw clenching or teeth grinding
  • Tension headaches
  • Generalised aches without injury

Muscle tension can become habitual over time.

Stress and anxiety can affect breathing patterns.

Common symptoms include:

  • Chest tightness
  • Shortness of breath
  • Frequent sighing or yawning
  • Sensation of not getting a full breath

These symptoms are frightening but are often benign once serious causes are excluded.

Stress can increase awareness of normal heart rhythms.

People may describe:

  • Palpitations
  • Fluttering or pounding heartbeat
  • Awareness of heartbeat at rest

These sensations are common in anxiety and stress but still require assessment if new or persistent.

The gut is highly sensitive to stress.

Stress-related gut symptoms may include:

  • Abdominal discomfort or cramping
  • Bloating
  • Nausea
  • Diarrhoea or constipation
  • Worsening of IBS-type symptoms

The gut–brain connection plays a major role.

Stress can alter sensory processing.

People may experience:

  • Dizziness or light-headedness
  • Tingling or numbness
  • Head pressure
  • Visual disturbance during anxiety or panic

These symptoms are often intermittent and fluctuate with stress levels.

Ongoing stress is a common cause of persistent fatigue.

This may involve:

  • Feeling physically drained
  • Poor recovery after rest
  • Reduced exercise tolerance
  • “Heavy” or leaden limbs

Fatigue often overlaps with sleep disturbance and low mood.

Why stress symptoms feel so physical

Stress heightens the body’s threat detection system. This can lead to:

  • Increased focus on bodily sensations
  • Lower tolerance for discomfort
  • Amplification of normal physical signals

Once symptoms appear, worry about them can further increase stress, creating a reinforcing cycle.

How GPs assess physical symptoms linked to stress

Assessment usually includes:

  • Nature, duration and pattern of symptoms
  • Triggers and relieving factors
  • Associated mental health symptoms
  • Impact on daily functioning
  • Medical history and medications
  • Examination where appropriate

When investigations may be considered

Investigations are guided by symptoms and risk factors.

A GP may consider tests if:

  • Symptoms are new, severe or progressive
  • There are red-flag features
  • Reassurance has not helped
  • There is diagnostic uncertainty

Normal test results can be reassuring and help focus on recovery rather than repeated investigation.


Managing physical symptoms of stress

Management focuses on reducing overall stress response rather than treating each symptom in isolation.

Helpful approaches may include:

  • Education and reassurance
  • Addressing ongoing stressors
  • Improving sleep and routine
  • Gentle physical activity
  • Breathing or relaxation techniques
  • Psychological therapies where appropriate

Symptoms often improve gradually as the nervous system settles.


When to seek further medical review

You should seek GP review if:

  • Physical symptoms persist or worsen
  • New symptoms develop
  • Symptoms interfere with daily life
  • Reassurance alone is not helping
  • You are unsure whether stress is the cause

It is always appropriate to ask for reassessment.

When to seek urgent medical help

Seek urgent help if you experience:

  • Chest pain suggestive of heart problems
  • Sudden weakness, speech difficulty or facial droop
  • New severe headache
  • Fainting or collapse
  • Significant unexplained weight loss

In these situations, urgent NHS services or emergency care are appropriate.


If physical symptoms are ongoing or worrying, an online GP appointment can help assess possible causes, decide whether tests are needed, and support a plan to reduce symptoms.

Last reviewed by Dr Zamiel Hussain, GMC registered GP
Updated: 23 January 2026