Fear and Disease 

It is well documented scientifically that negative emotions when strong enough or chronic are associated with a weakened or altered immune response. There are 3 types of negative emotions(N.e): a/N.e.based on fear(fear,panic,terror etc.) b/N.e.based on anger(anger,rage,guilt etc.) c/N.e. based on sadness(sadness,sorrow,worry etc.) All of these negative emotions come from and  are linked to negative beliefs and thoughts about ourselves ,diseases etc. 
These negative emotions and beliefs lead to a reduced immune response.
When this reduced immune response  remains chronic it is sooner or later inextricably connected  to the physical symptoms of a disease. To understand how harmful negative emotions are to our health  we will briefly discuss a basic negative emotion the deep cause of all negative emotions:Fear
 
                              Fear
 The frequency of fear is around 4 Hz a low frequency state. Fear is generated in the amygdala a region in  the temporal lobe of the brain.When  the brain goes into hyper-alert due to fear,pupils are dilated,respiratory rate quickens,blood pressure and heart rate both increase,the rate of glucose delivery to muscles  increases  and the body prepares for a fight or flight (or freeze)reaction to danger.
Another part of the brain called the hippocampus is closely related to the amygdala.
Hippocampus and the prefrontal lobe help a person know whether the danger is real or not :for example how we react when we see a snake free in the jungle or in a cage at the zoo.
It is the amygdala among other functions that also activates the sympathetic autonomous nervous system for this fight or flight (or freeze) response.
Sympathetic nervous fibers now,start from the brain and end in the primary organs of the lymphatic system(bone marrow and thymus)but also in the secondary ones(spleen and lymph nodes).
These fibers release a variety of factors that affect the immune response by binding to receptors present in white blood cells.
In addition they secrete various hormones such as: epinephrine/norepinephrine/cortisol/prolactin/growth hormone and brain neuropeptides:enkephalin/b-endorphin/melatonin etc.
These substances bind to white blood cell receptors  and are responsible for altered immune regulatory functions.
So we see how fear negatively affects  our immune system s response thus predisposing us to disease.
The real problem starts when there is:
a/Sudden great fear b/Chronic fear.
Also whether the threat is real or imagined the response is the same.
EFT and especially OEFT neutralizes this connection between amygdala -fear-sympathetic  response thus reversing this negative cycle which causes disease.
Finally according to various experts when chronic fear:headaches become migraines/muscle aches become fibromyalgia/shortness of breath  becomes chronic asthma/body aches become body pain etc.
Also fear is responsible for:Chest pain/chills/dry mouth/nausea/rapid heartbeat/sweating/tremor/upset stomach/endocrine system dysfunction/insomnia /insulin resistance/shortness of breath etc.
Furthermore chronic fear causes chronic anxiety and people try to soothe it using various substances/addictions such as: drugs, alcohol,smoking gambling,sex etc .which also harm the immune system.
There are many other harmful consequences to our health because of chronic fear(environmental, spiritual etc.)which I will not mention here.