Stress is a normal part of life. It can help people react fast in danger or tough situations. But health experts warn that stress can become harmful when it lasts too long and the body never gets time to recover. Modern stress often starts with small daily problems. A late start to the morning, online arguments, family pressure, money worries, or work demands can all trigger the body’s stress response. Even though these problems are not life-threatening, the body still reacts as if danger is near. Experts say this response comes from ancient survival systems that once helped humans escape attacks and survive harsh conditions. Prof. Kavita Vedhara, a specialist in stress and behavioral medicine at Cardiff University, explained that the body reacts quickly during stressful moments. She said stress causes a rush of adrenaline that increases heart rate, breathing, and blood pressure. This is known as the fight-or-flight response. The system prepares the body to face danger or escape from it. Around 30 minutes later, the body also releases cortisol, often called the stress hormone. Cortisol helps control blood pressure, lower inflammation, and increase energy by raising blood sugar levels. These changes were useful in early human history when stress mainly involved physical threats. Today, however, stress often comes from emotional pressure, social media, relationship problems, or financial worries. Experts say the body does not always know the difference between physical danger and emotional stress. When stress levels rise, the body shifts energy away from systems linked to rest, digestion, repair, and immune defense. This is not dangerous for short periods. Problems begin when stress becomes constant. Vedhara said long-term stress may weaken the immune system, increase the risk of infections, slow wound healing, and even reduce vaccine effectiveness. Research has also linked chronic stress to obesity, depression, and diseases linked to brain decline, including Alzheimer’s disease. Dr. Jo Daniels, a senior lecturer in psychology at the University of Bath, said stress can also create a harmful cycle inside the body. She explained that people often become alarmed by stress symptoms such as a racing heart or tight chest. This can make them focus more on normal body sensations, which then increases anxiety and stress even further. Daniels said people under stress become hyper-alert and may wrongly believe normal physical feelings are signs of danger. Stress hormones can also affect clear thinking and decision-making. This may lead people to avoid social events, overwork themselves, or react emotionally in ways that increase stress instead of reducing it. Scientists are still studying how much stress becomes too much. Experts say the body is designed to recover after stressful moments, but long-term stress can slowly damage health and wellbeing. Lifestyle factors can also make stress more dangerous. In one major study from the 1990s, researchers exposed healthy volunteers to the common cold virus. The results showed that highly stressed people were more likely to become sick. Experts say older adults may face stronger effects because the immune system naturally weakens with age. At the same time, stress tolerance differs from person to person. Daniels said life experiences, trauma, resilience, and coping skills all affect how people respond to pressure. Some people work well in stressful jobs, while others may struggle with smaller challenges because of past experiences or emotional strain. Health experts say one simple but effective way to reduce stress is controlled breathing. Daniels explained that stressed people often breathe quickly and shallowly, which keeps the body in a threat state. Slower breathing helps send calming signals to the brain and may reduce the stress response. Exercise can also help by lowering excess adrenaline levels in the body. For people dealing with ongoing stress, experts recommend evidence-based therapies such as cognitive behavioral therapy, also called CBT. This method helps people question negative thoughts and build healthier coping habits. Mindfulness-based stress reduction is another option. Instead of challenging thoughts, mindfulness teaches people to observe stressful feelings without reacting strongly to them. Experts say avoiding stress completely is impossible. Instead, people should focus on managing stress in healthy ways and dealing with the real causes behind it. This may include limiting social media use, improving work-life balance, seeking social support, or having difficult but necessary conversations. Daniels said people should seek help if stress becomes constant or starts affecting daily life, sleep, health, or relationships.