In general, stress is related to both external and internal factors. External factors include the physical environment, such as your job, your relationships with others, your home, and all the situations, challenges, difficulties, and expectations you’re confronted with on a daily basis. Internal factors determine your body’s ability to respond to, and deal with, the external stress-inducing factors. Internal factors which influence your ability to handle stress include your nutritional status, overall health and fitness, the amount of sleep/rest you get, as well as your emotional well-being.