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Researchers have discovered that angry men aged 20 to 40 were one-and-a-half times more likely to be dead 35 years later than those who were calmer. They believe this is due to a number of factors linking stress to physiological damage. The frequent release of adrenaline during periods of stress damages DNA, which could lead to life-threatening illnesses such as multiple sclerosis.

Feelings of anger produce a heightened response in the amygdala, the part of the brain associated with survival instincts. Angry emotions prompt the amygdala to signal a heightened state of anxiety to the rest of the brain and the body, increasing blood flow to the limbs and heart, which makes relaxation impossible.

Those exposed to anger-inducing stimuli without discussing how it made them feel are more likely to experience insomnia than those who engage in an emotional ‘debrief’, according to neuroscientists. Writing the cause of anger frees up the space in the head, dampening the fear response and encouraging relaxation.

Emotions such as excitement or anger result in the release of stress hormones cortisol, adrenaline and testosterone, which put the body into flight-or-flight mode. The chemical surge increases blood flow to the brain and triggers the swelling of both blood vessels and nerves surrounding the brain. The pressure can result in tension and headaches.
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Highly hostile individuals performed significantly worse on a simple inhalation task than those who were rated less hostile. When you are angry, neurotransmitters and hormones are sent through the bloodstream which, in turn, increase both the heart rate and muscle tension. Frequent occurrence of this reaction puts a strain on neurons in the hypothalamus, the brain’s ‘stress control centre’, meaning that it becomes harder for the neurons to switch off. And the ‘happy hormone’ serotonin is significantly depleted in some aggressive individuals.

Too much cortisol in the body – released by adrenal glands during angry outbursts can cause an imbalance in blood sugar, repress the thyroid and even decrease bone density. When released initially, cortisol triggers an anti-inflammatory response by the immune system, but prolonged increase of the hormone makes the body more susceptible to viruses. As blood pressure rises thanks to a surge in adrenaline, the heart beats faster, increasing the risk of potentially fatal abnormal heart rhythms. Adrenaline also signals for the release of platelets, which can trigger blood clots or block arteries – particularly dangerous if arteries are restricted by a build-up of cholesterol.

Studies have shown that men in particular who score highly on trait anger scales are three times more likely to suffer from general heart disease. Once the ‘fight or flight’ signal has been issued by the brain, blood supply is directed to areas needed for action such as the limbs. That means blood supply to the digestive system is reduced, with a reduced amount of oxygen provided to keep vital ‘good’ bacteria in the gut alive. A dampened immune system can lead to a weakened gut lining, increasing vulnerability to harmful bacteria entering the area.

Heightened stress reduces the amount of available glucocorticoids -the hormone involved in the synthesis of the skin-plumping compound collagen. Lack of collagen contributes towards saggy, wrinkled skin. The weakened immune system caused by stress responses increases inflammatory reactions to pathogens underneath the skin.

Enhanced periods of anger disrupt the skin-barrier function, making it easier for allergens to penetrate and resulting in skin conditions such as dermatitis and psoriasis. Repressing, rather than expressing anger puts you at an higher risk of developing health problems. This increased risk of hypertension for angry individuals who tended to keep their anger below a level of consciousness. By repressing emotion, excess stress hormones remain in the emotion-processing areas of the brain for longer period making physical reactions chronic.
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