What effects can fear and anger have on my body?

William B. Salt II., MD

Fear and anger have different effects upon your body. In the gastrointestinal tract, fear reduces contractions and secretions (e.g. acid) in the upper digestive tract (stomach and duodenum), leading to nausea, fullness, and loss of appetite. In contrast, fear increases contractions and secretion in the lower digestive tract (colon and rectum), resulting in diarrhea and abdominal pain. This response could be associated with the symptoms of nausea and diarrhea. This gut response to fear has been built in and encoded within you. From an evolutionary standpoint, the response evolved to minimize the exposure of the gut to food and waste material that would otherwise use energy needed by muscles in order to fight or flee. In short, the emotion of fear shifts energy from the gut to the muscles. It comes at a cost, but survival depends upon it.

On the other hand, anger operates differently in the gut. Its effects are just the opposite of fear’s effects. Anger increases stomach contractions that can lead to upper abdominal pain. It reduces colon contractions, which results in constipation. With each case, the gut experiences the unique and stereotyped impact of emotion. Fear loosens your bowels. Anger bottles you up. But when emotions come into play, the gut is not the only system implicated.

Your emotional responses are not limited to the gastrointestinal tract. All organs and tissues of the body are involved. This includes the mind/brain, even if and when it doesn’t know what is going on.

Still Hurting? FIND HEALTH! Discover What's Behind Your SYMPTOMS (That Doctors Can't Explain)

More About this Book

Still Hurting? FIND HEALTH! Discover What's Behind Your SYMPTOMS (That Doctors Can't Explain)

Still Hurting? FIND HEALTH! presents a new model of disease, which empowers readers suffering with pain, symptoms (e.g., fatigue), and symptom syndromes (e.g., irritable bowel, fibromyalgia, chronic...

Continue Learning about Emotions



Medical science recognizes a mind-body connection and that your emotions may affect your body's physical health. Being down or depressed can cause fatigue, aches, and pains. If you are having problems and are also stressed, it's a ...

good idea to let your doctor know. This can be part of the diagnosis. Seeking an emotional balance and developing some resistance to bad feelings can be an important step to improved health. Techniques to improve your emotional health can range from medication to talking with an advisor, eating healthfully or exercising.

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.