Describe what stress is and how it affects your body. address physiological fight-or-flight responses and how those responses relate to your cardiorespiratory and muscular systems

Stress is not an illness itself, but if it isn't under control it can cause serious illnesses, such as heart disease, asthma, stroke, diabetes and some types of cancer. Spotting the early signs of stress, like sweating, loss of appetite, headaches and loss of concentration will help prevent it getting worse.

If you are stressed you may feel worried, anxious, irritable or have low self-esteem. You may also notice that you lose your temper more easily, drink more or act unreasonably.

Your mood and how well you sleep affect each other. Feeling stressed can mean you don't sleep well enough, and if you don't sleep well enough this may make you feel more stressed.

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