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cancer. Asthma is a respiratory disorder marked by the temporary constriction of the bronchi, the airways branching from the trachea to the lungs. Attacks are usually brought on by allergic reactions to antigens, such as grass and tree pollen, mould spores, fungi and certain foods but also may be caused by chemical irritants in the atmosphere or by infections of the respiratory tract. Susceptibility to an asthma attack is based on hyperactivity of the bronchial muscles, which constrict on exposure to one or any of these agents. Chronic stress reduces the efficiency of the adrenal glands, reducing the output of anti inflammatory and anti allergic adrenal hormones, which may make an asthma attack more likely. Diabetes is caused by the inability of the body to metabolise sugar correctly, leading to excessively high levels of sugar in the blood. Sugar metabolism is the responsibility of the hormone insulin, which is secreted by the pancreas. Most diabetics can produce insulin but various factors limit the hormone's efficiency, known as 'insulin sensitivity'. The release of adrenal hormones under stress can have a significant impact on blood sugar levels. Adrenaline causes sugar in the liver to be put into the blood stream and cortisol acts to reduce the metabolism of glucose by cells. Large amounts of cortisol act to decrease insulin sensitivity. High blood sugar levels are not dangerous in normally healthy individuals but chronic stress, combined with other factors such as obesity, act to increase the likelihood of developing diabetes. Ulcers are frequently associated with stress, although no conclusive link has yet been demonstrated. Normally the lining of the stomach is covered with a layer of mucus to protect it from the digestive acids and enzymes used in the breaking down of food. Over time, chronic stress can stimulate the overproduction of gastric juices, which break down the protective mucus and act upon the walls of the digestive tract, resulting in ulceration. Ulcers usually occur singly in round or oval lesions; the erosions are usually shallow but can penetrate the entire wall, leading to haemorrhage and possibly death. Many problems with the digestive tract, such as constipation, diarrhoea and irritable bowel syndrome are linked to stress. The nerves in the digestive tract receive messages from the brain in the form of hormones, which tell the intestinal muscles to expand or contract. Hormonal imbalances can cause alterations in intestinal function, such as spasms, constipation and diarrhoea. Chronic stress tends to shut down the digestive system altogether, exacerbating intestinal problems. Stress increases levels of toxicity in the body and contributes to hormonal imbalances, both of which have an effect on the skin. The visible effects of stress on the skin include:- acne, spots, skin diseases, eczema, excessive pallor and psoriasis. Headaches are one of our most common afflictions and are normally caused not by disease but by fatigue, emotional disorders or allergies. Intermittent tension headaches are