Stress: Symptoms, Effects and Management

What happens in the body during stress

When you perceive a threat or pressure, the brain's hypothalamus activates two systems:

• The sympathetic nervous system releases adrenaline, causing the "fight or flight" response: a faster heart rate, rising blood pressure, quicker breathing, tense muscles and a surge of blood sugar.
• The HPA axis (hypothalamus, pituitary and adrenal glands) releases cortisol, which keeps energy available and dampens non-urgent functions like digestion and reproduction.

These responses help in short bursts. When stress is constant, they stay switched on, which wears on the body over time.

Types of stress

Symptoms of stress

Physical symptoms

• headaches, especially tension headaches
• muscle tension, neck, shoulder and back pain
• jaw clenching and teeth grinding
• fatigue
• poor sleep or insomnia
• racing heart or palpitations
• stomach upset, heartburn, diarrhea or constipation
• changes in appetite
• frequent colds
• reduced sex drive

Emotional and mental symptoms

• feeling overwhelmed, anxious or on edge
• irritability and short temper
• low mood
• racing thoughts, constant worry
• poor concentration and forgetfulness
• difficulty making decisions

Behavioral signs

• withdrawing from people
• procrastinating or neglecting responsibilities
• drinking more alcohol, smoking or using drugs
• overeating or undereating
• nail biting, fidgeting

Common causes

• work pressure, job insecurity, long hours
• money worries
• relationship problems, divorce
• caring for a family member
• illness or injury
• bereavement
• major life changes: moving, a new baby, retirement
• discrimination, unsafe neighborhoods, social isolation
• traumatic events

Effects of long-term stress on health

• Heart and circulation: raised blood pressure, higher risk of heart attack and stroke
• Mental health: anxiety disorders, depression, substance misuse
• Digestion: worsened irritable bowel syndrome, reflux
• Immune system: more infections and slower healing
• Metabolism: weight gain around the abdomen, higher risk of type 2 diabetes
• Pain: worsening of headaches, back pain and fibromyalgia
• Sleep: chronic insomnia
• Reproductive health: irregular periods, reduced libido

How doctors assess stress

There is no test for stress. A doctor will ask about symptoms, sources of stress, sleep, mood, alcohol and drug use, and how you are coping. They may check blood pressure and order tests to rule out conditions that mimic stress, such as thyroid problems or heart rhythm disorders, and screen for depression and anxiety.

How to manage stress

Look after your body

• Exercise: regular aerobic activity, even a 20 to 30 minute walk, reduces stress hormones and improves mood.
• Sleep: keep a regular schedule, aim for 7 to 9 hours, and limit screens before bed.
• Eat regularly and limit caffeine.
• Limit alcohol, which worsens sleep and mood.

Calm the stress response

• Slow breathing: breathe in for 4 seconds and out for 6 seconds for a few minutes.
• Progressive muscle relaxation: tense and relax muscle groups in turn.
• Mindfulness and meditation: evidence supports mindfulness-based stress reduction programs.
• Yoga and tai chi.

Address the sources

• break big problems into smaller steps
• prioritize and say no when you can
• set boundaries around work and devices
• seek practical help: financial counseling, caregiver support, workplace adjustments

Stay connected

Talk with friends and family, join a support group, or volunteer. Social support is one of the strongest buffers against stress.

Professional help

• Cognitive behavioral therapy (CBT) helps change patterns of thinking and behavior that drive stress.
• Counseling for life events, grief or relationship issues.
• Medicines are not used for stress itself but may be prescribed for anxiety, depression or insomnia.

Frequently asked questions

What are the physical symptoms of stress?

Common physical symptoms include headaches, muscle tension and aches, fatigue, poor sleep, a racing heart, stomach upset, changes in appetite, frequent colds and reduced sex drive. Symptoms like chest pain should always be checked rather than assumed to be stress.

How does stress affect the body long-term?

Chronic stress keeps stress hormones elevated, which can raise blood pressure, increase the risk of heart disease and type 2 diabetes, weaken immunity, disrupt sleep and digestion, and contribute to anxiety and depression.

What is the fastest way to reduce stress?

Slow, deep breathing for a few minutes calms the nervous system quickly. A short walk, stepping away from the stressor, or talking to someone you trust can also help. Long-term, regular exercise, sleep and social support make the biggest difference.

When should I see a doctor about stress?

See a doctor if stress lasts more than a couple of weeks, interferes with work, relationships or sleep, causes physical symptoms, or leads you to drink or use drugs to cope. Seek help immediately for thoughts of self-harm.

Can stress make you sick?

Yes. Long-term stress weakens the immune system, making infections more likely, and can worsen conditions such as high blood pressure, IBS, migraines, skin conditions and depression. Managing stress is part of looking after physical health.